Thursday, February 04, 2021


The photo shows four recently acquired Mac minis that were meant to complement my previously-existing Leyland prime search farm. The "silver" one is the new M1 Mac mini and I did not find it suitable for the task, so it is not part of the farm. The other three are Intel and add 18 cores to the previous 54, for a total of 72 cores. This will help with my current work on interval #18 which is checking for the probable primality of 1087659 terms ranging in size from 111532 to 121787 decimal digits. My updated-in-real-time search results are posted on my indexing the Leyland primes document.

Saturday, January 16, 2021

My 1000th Leyland prime find

This evening I found my 1000th Leyland prime. My 500th was only ten months ago! The above chart extends the graph that I posted back then. I have 579 red values found using Mathematica (from 3 October 2015 to 3 July 2020), followed by 421 blue values found using xyyxsieve & pfgw64 (from 6 July 2020 on). I have it in mind that I might actually achieve 1500 finds by later this year. It's a tough target to reach because I'll be picking all the remaining low-hanging fruit (< 150000 decimal digits) in the ongoing search and I don't believe that there are quite 500 of those left.

Friday, January 15, 2021

A little excitement

SWAT team entering a house across the street at 4:30 pm
My guess is that this is related to the Oakville gun-shots incident. The woman that vacated the Oakville residence at 3 pm may have told police that the man still inside had a connection to this rooming house. Perhaps he (or a relative of his) is a tenant herein. I did spot a Halton police vehicle on the street after the SWAT team had left.