A322960 Numbers k such that 335*2^k+1 is prime.
19, 23, 29, 173, 263, 295, 659, 803, 1075, 1087, 1129, 1189, 3173, 4519, 16277, 44425, 67069, 103789, 151319, 189379, 323767, 356029, 409429, 528439, 1335337, 3266237
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(335*2^n+1),[$1..1000]); # Muniru A Asiru, Dec 31 2018
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Mathematica
Select[Range[1000], PrimeQ[335*2^# + 1] &] (* Robert Price, Dec 31 2018 *)
Extensions
a(26) from Jeppe Stig Nielsen, Dec 20 2024