A032402 Numbers k such that 105*2^k+1 is prime.

1, 2, 5, 7, 8, 12, 14, 23, 27, 33, 38, 49, 61, 62, 85, 93, 94, 107, 155, 182, 215, 273, 382, 392, 413, 434, 490, 1631, 3063, 3331, 3461, 3619, 4199, 4298, 5191, 7967, 8837, 9589, 10367, 13700, 14458, 14821, 21021, 21409, 22939, 29927, 30552, 30840

Offset

1,2

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..80 (terms n = 1..74 from Robert Price)

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Prog

(PARI) is(n)=ispseudoprime(105*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A192111 A294635 A362591 * A299326 A280848 A190900

Adjacent sequences: A032399 A032400 A032401 * A032403 A032404 A032405

Keyword

nonn,changed

Author

James R. Buddenhagen

Status

approved