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Old 2021-10-14, 09:27   #3
Alex
 
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"Alex_soldier (GIMPS)"
Aug 2020
www.Mersenne.ru

1510 Posts
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Hello, bur.

I myself accidentally found out about Pierpont primes looking someone's old results page.

3^39 is max < 2^63.

When I discovered a new Proth prime (P), I check a lot of possible chains and numbers near it:

Code:
F() & GF() & xGF() // Possible Fermat divisor
P+2 // Possible Twins
P-2 // Possible Twins
P+4 // Possible Cousins
P-4 // Possible Cousins
P+6 // Possible Sexy or part of AP
P-6 // Possible Sexy or part of AP
P+8 // Possible part of tuplet
P-8 // Possible part of tuplet
P+10 // Possible part of tuplet
P-10 // Possible part of tuplet
P+12 // Possible part of AP
P-12 // Possible part of AP
P+18 // Possible part of AP
P-18 // Possible part of AP
P+24 // Possible part of AP
P-24 // Possible part of AP
P+30 // Possible part of AP
P-30 // Possible part of AP
P+210 // Possible part of AP
P-210 // Possible part of AP
2*P+1 // Possible Cunningham 1st or Safe / Sophie Germain
2*P-1 // Possible Cunningham 2nd
(P+1)/2 // Possible Cunningham 2nd
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