A032373 Numbers k such that 47*2^k+1 is prime.

583, 1483, 6115

Offset: 1

Author

James R. Buddenhagen

Keywords

• nonn
• hard
• bref

Comments

Next term >= 4100000. - Joerg Arndt, Apr 07 2013

Links

• 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

Programs

PARI

is(n)=ispseudoprime(47*2^n+1) \\ Charles R Greathouse IV, Feb 20 2017