Wednesday, May 16

Weston's archaeological sites

There are two archaeological sites in Weston and this morning I visited the Toronto Reference Library to see if I could document where exactly they might be. The book was Victor Konrad's 1973 "The archaeological resources of the Toronto planning area". I was more than a little disappointed with what little detail I found.


The two open circles represent Weston's two sites in the then- Borough of York, the upper-left one called "Scarlett Rd." (AkGv-5) and the lower-right one called "Bellevue Cr." (AkGv-6). I dealt with the Bellevue Crescent "Weston bones" site here, so we know the exact location of it. The circle in Konrad's map has it too far to the right by some 250 meters. I wonder if the Scarlett Rd. circle is similarly displaced. At the very least that would bring it closer to Scarlett Road which lies on the other side of the Humber River (the thick wavy line to the left of the circles).

Clearly the circles were not meant to be an accurate placement of the archaeological sites. Konrad lists the Scarlett Rd. site in the Borough of York (a 1967 municipality that absorbed the former town of Weston) but the actual Scarlett Road is not in that borough. Rather, it is in the adjacent municipality of Etobicoke. This discrepancy should be resolvable by a reference that notes the exact location of AkGv-5 but I can't seem to find an original source. It's not just the archaeological sites that have disappeared. Even the information about them is slowly becoming lost!

Tuesday, April 17

A 100031-digit Leyland prime

In February I explained the status of my current Leyland-primes search, hoping therein to have scored my first Leyland prime with more than 100000 decimal digits by this summer.

Today I achieved that milestone with 23406^18781+18781^23406, which contains in its expanded form 100031 decimal digits.

Saturday, April 14

Lost in conversion

I thought I'd give the Netflix reboot of Lost in Space a go just now. To be clear, I'm old enough to have watched the mid-1960s original and I didn't think much of it. Three minutes into the first episode of the remake, the starship is losing altitude:


I've enabled the subtitles in the screen grab so that you might comprehend my objection. I decided not to watch any further.

Tuesday, April 10

Ancestry

I got my ancestry-by-populations chart from 23andMe today:


No real surprises. My father's family is the German component. The Netherlands and Denmark matches just serve to regionalize which part of Germany (northwest) that family lived. Poland is there, of course, because that was my mother's mother's place of birth. We had always thought of my mother's father as Russian and the match for Ukraine is a nominal step in that direction, as one mustn't take these countries literally.

Somewhat more surprising is the 8.7% British and Irish component. It doesn't mean, I'm sure, that I have an ancestor that hails therefrom. Rather, some British and Irish populations share a common ancestry with me.

Wednesday, April 4

California dreamin'

Yesterday morning I noticed a couple of small plastic STUCCO advertising-signs nailed to the hydro utility pole in front of my house and — sure enough — two more on a pole up the street. I've been waging war on these signs for a good number of years! So I surveyed the immediate neighborhood (some six streets) and found two more pairs, on Lippincott St. W. and Edmund Ave. In the afternoon — wearing my high-visibility safety vest, a hammer under my belt and a small ladder on my shoulder — I took them all down.

In my survey I discovered a "medical marijuana" dispensary on the northwest corner of Weston Rd. and Lippincott St. W. (The only time I might find myself at this intersection is for the across-the-street Dairy Queen, which is closed in the winter.)


This is the first such business (of which I am aware) in Weston, albeit the south end thereof. Apparently, it is a concern.

Saturday, March 31

Go fund me

I wrote about our local "reverend" Patrick White of the Chaplain's Office here and here. When I was doing all that research on him I somehow missed the February 2017 fundraiser set up by York St. Peter's, an evangelistic organization based in Woodbridge ON. White's friend, Oliver, is noted as being in "serious condition" after he "was overcome with smoke and suffered 3rd degree burns" fighting a stove fire in White's apartment — which Oliver had been assigned to "watch" while White was out of town. Oliver, I guess, was augmenting his watching with a little cooking.

Another casualty of the fire was Patrick White's parakeet, Joey, who came through the ordeal with a bit of smoke inhalation. Joey is mentioned in a photo on the Chaplain's Office website:


Wait a second! Your friend Oliver was seriously hurt in a fire in your apartment and all you can say is that he was recently married ?!

Thursday, March 15

More English number words in base-26 pi

I last worked on this in January 2013. Dropping the final "googol" line from that post's in situ list, but continuing with subsequent finds:

..datnmvbwezlfygflonebugwcjooatbjbskh..
..wzlwdhgbhphxeqsqfourdjjmmikzqwvivabm..
..pceoeiigwyqtmaustwoamxyatxhqxoyzbno..
..ifnuetcfdxrwipodsixyavsnasweexagllo..
..ectasqgcghjmzirrtenfjiphdkdoumqzpjt..
..dwbfgegkqjwkubjvfivewgjlbihzmwgalifm..
..jyhdeevmsxmbxtbininesuzrnrzsxosctuxm..
..efzoqitnhuljsgztzerovlptejdfwretaara..
..hwdvoynebabsyjkdsevenaabgjthpqgapqnrg..
..cgakthjgxsmoldokthreeapdiuhncqcjgsmnt..
..gfaoforthfmdhgkzfiftyxiboudqllqzqlcmh..
..obptjczwqdirtnvmfortyigfxwmybvztjkhbc..
..hubksmltneixkvpheightmgsxrwaqokrdcpnw..
..ttsybfashnuibvlisixtytdchrjcvvzazzivu..
..wltescttnomsztonelevenfyifyclxdcacsfta..
..qpddtdyuitfganmgninetyhecteviwajvcosrv..
..kvvtnvsdypwsumzveightysstqdeajfbyxrrde..
..iuwxlmueqjjzpbcmtwelveefcsszipcnmifmzp..
..ssoshdnbsnembdkgthirtyqwbfxohiadwgtvya..
..fcgcgwvbsyihoavxtwentymbigcbkjfiuezgex..
..edapsvilnlndkwusfifteenzkfkepmwhsauydgc..
..mkczsxsgslvltfxqnineteenpxzlphhysfrfpjwp..
..gmrxvlhvuocxdssaseventyurdrqcdywvowytwb..
..qndvrurhkjaqjqabsixteennwdbnngckhpzduwr..

These are the numbers' first occurrences, at indices 10087, 11324, 13463, 14295, 15276, 64838, 175372, 389247, 786244, 1556763, 2300987, 8879098, 9202330, 9946442, 33027856, 126003234, 126348794, 238426469, 389952198, 536531272, 1709539474, 5624040208, 7690604024, 7869864133, respectively.

I excluded "googol" because it's just a slang name for "ten duotrigintillion". Likewise, I've excluded "hundred", "million", "billion", because in proper English I expect them to be modified by a numerical adjective. Regardless, for the record, here they are:

..dnihymgxncwxfhsdgoogolxvodlfjhbzlnrucr..
..knqqklhgazusrbummillionziaocmauzjxqqrdo..
..bcqtdtvmnmumvmhqhundrednizjohkrhvlzdkpv..
..qgrqqgrlwjuobeyfbillionliuisnrlcobglhiv..

... whose shown first occurrences are at indices 454315613, 942420517, 2169343694, 4359384810, respectively. In December 2000, I created a sequence of numbers: 1, 4, 2, 6, 10, 1, 2, 2, 6, 10, 6, 10, 2, 2, 5, 2, ... representing the (proper) number words in the order in which they occur. I now have a very large number of terms for this sequence. Back then I noted eight consecutive 6s by showing them in blue. In my now-larger list, there are ten consecutive 6s. There are also eleven consecutive 2s, twelve consecutive 1s, and thirteen consecutive 10s.

Tuesday, March 6

Facts first


This local red-light camera setup became operational on 20 October 2017. The first photo shows the scene on the northeast corner of Lawrence Ave. W. and Weston Rd. A second picture shows it from the other direction:


A reporter for WestonWeb (an acquaintance to whom I still owe a couple of beers) seemed to be unaware of its existence when he suggested that "there are only 77 red light cameras in the whole of Toronto and only one remotely close to our area (at Keele and Lawrence)". His erroneous 77 was apparently based on this City of Toronto website:

I attempted to get him to acknowledge that the number was small but he didn't think that that was too important: "... whatever the actual number and location is, it’s inadequate" and then doubled down on the number: "I believe that unmarked red light cameras should be at many more intersections than the current 77."

Banana, banana, banana! It wasn't too difficult to extract the actual apple from the basket. The supervisor of Toronto's Red Light Camera Operations assured me that — as of today — there are 124 red-light cameras in operation.

Tuesday, February 27

Area

The blue mesh consists of unit squares. What is the area of the black rectangle?

Saturday, February 24

The long compute

Around the middle of 2017, I started looking for Leyland primes between L(40210,287) and L(40945,328). L(x,y) = x^y + y^x and we assume x >= y > 1. L(40210,287) is Leyland #324766365 and L(40945,328) is Leyland #349812824. So there are 25046458 Leyland numbers between them which I want to check for probable primality. Any given check may take a significant amount of time since we are dealing with numbers that are roughly 100000 decimal digits long.

I haven't been totally committed to the task for the entire period but I may perhaps have spent six months on it. Since I've only covered about one fifth of the territory, I have two years to go! I was going to add some processors to the task but my intended purchase of a new machine has (sadly) been stymied. There was a second issue. My list of sorted consecutive Leyland numbers only went up to #331682621, having been computed with the sole objective of reaching 100000-digit numbers (which it did). I thought I was going to need the new computer to calculate more terms because my indexing computation was limited by available RAM and my current machines can't take any more than 64 GB. Fortunately, I recently discovered that that was sufficient to extend the indexing to L(40945,328).

The good news is that I have so far found eight previously unknown Leyland primes, ranging in size from 98889 to 99659 decimal digits. By this summer I should have scored my first Leyland prime with more than 100000 decimal digits. There are currently only nine known Leyland primes <decimal digits> larger than this:

L(40945,328)  <103013>     Norbert Schneider  Dec 2014
L(41507,322)  <104094>     Norbert Schneider  Dec 2014
L(222748,3)   <106278>     Anatoly Selevich   Dec 2010
L(45405,286)  <111532>     Norbert Schneider  Apr 2015
L(48694,317)  <121787>     Norbert Schneider  Aug 2015
L(234178,9)   <223463>     Anatoly Selevich   Jul 2011
L(255426,11)  <265999>     Serge Batalov      May 2014
L(314738,9)   <300337>     Anatoly Selevich   Feb 2011
L(328574,15)  <386434>     Serge Batalov      May 2014