A032497 Numbers n such that 241*2^n+1 is prime.

36, 72, 288, 5528, 8904, 9876, 130992

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• hard

Links

• Ray Ballinger, Proth Search Page
• Ray Ballinger & 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

Crossrefs

Cf. A032373, A032419, A032460.

Programs

PARI

is(n)=ispseudoprime(241*2^n+1) \\ Charles R Greathouse IV, Jun 07 2017

Extensions

One more term (from the Ballinger-Keller web page) from M. F. Hasler, Apr 18 2007