A322961 Numbers k such that 337*2^k+1 is prime.
4, 6, 10, 26, 64, 66, 70, 102, 322, 370, 570, 1750, 1782, 1974, 2482, 6886, 7782, 9784, 20476, 34826, 37546, 46566, 47800, 132962, 184230, 257930, 286554, 370274, 544852, 648856, 2585660, 2750860, 3274106
Offset: 1
Links
- Ray Ballinger, Proth Search Page
- Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
- Y. Gallot, Proth.exe: Windows Program for Finding Large Primes
- Wilfrid Keller, List of primes k.2^n - 1 for k < 300
- Eric Weisstein's World of Mathematics, Proth Prime
- Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
Programs
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Maple
select(n->isprime(337*2^n+1),[$1..1000]); # Muniru A Asiru, Dec 31 2018
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Mathematica
Select[Range[1000], PrimeQ[337*2^# + 1] &] (* Robert Price, Dec 31 2018 *)
Extensions
a(31)-a(32) from Jeppe Stig Nielsen, Dec 27 2019
a(33) from Jeppe Stig Nielsen, Dec 20 2024