A322963 Numbers k such that 341*2^k+1 is prime.
1, 3, 7, 19, 21, 33, 43, 99, 183, 235, 499, 579, 1137, 1225, 1941, 1987, 2409, 3285, 9093, 9121, 11043, 14997, 17919, 31543, 57163, 83595, 127915, 129199, 220651, 384961, 1255881, 1325277, 1728697, 3300789, 3686613, 3938565
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(341*2^n+1),[$1..1000]); # Muniru A Asiru, Dec 31 2018
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Mathematica
Select[Range[1000], PrimeQ[341*2^# + 1] &] (* Robert Price, Dec 31 2018 *)
Extensions
a(34)-a(36) from Jeppe Stig Nielsen, Dec 20 2024