A323200 Numbers k such that 461*2^k+1 is prime.

5, 7, 17, 41, 175, 14621, 14711, 25775, 49591, 120767, 204809, 655327, 2007631

Offset

1,1

Links

Table of n, a(n) for n=1..13.

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

Mathematica

Select[Range[1000], PrimeQ[461*2^# + 1] &]

Crossrefs

Sequence in context: A239414 A163570 A113282 * A096741 A355188 A106955

Adjacent sequences: A323197 A323198 A323199 * A323201 A323202 A323203

Keyword

nonn,more,hard

Author

Robert Price, Jan 06 2019

Extensions

a(13) from Jeppe Stig Nielsen, May 30 2020

Status

approved