Ryan Propper ("ryanp" on Mersenne forum) had not contributed any Leyland primes prior to Wednesday, when he proclaimed
this 1433792-digit integer to be a PRP. Then yesterday, he added
another (at a mere 582101 digits) that had a
small y [L(x,y) defines a Leyland integer as x^y+y^x, x≥y; here y=2]. The current top-five Leyland prime leaderboard now sports
three million-digit Leyland primes (the first column is the number of digits):
1433792 (300102,59935) Ryan Propper May 2023
1000175 (218767,37314) Gabor Levai Mar 2023
1000027 (211185,54364) Gabor Levai May 2022
582101 (1933695,2) Ryan Propper May 2023
506429 (107890,49423) Miklos Levai Feb 2022
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