

A032373


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


3




OFFSET

1,1


COMMENTS

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


LINKS

Table of n, a(n) for n=1..3.
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^n1 (or k*2^n+1) is prime


PROG

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


CROSSREFS

Sequence in context: A244344 A059468 A122694 * A236486 A236491 A235433
Adjacent sequences: A032370 A032371 A032372 * A032374 A032375 A032376


KEYWORD

nonn,hard,bref


AUTHOR

James R. Buddenhagen


STATUS

approved



