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A032502 revision #18

A032502
Numbers n such that 251*2^n+1 is prime.
0
1, 11, 13, 17, 35, 77, 155, 325, 4097, 5471, 7151, 7561, 9211, 13535, 14627, 18361, 21815, 41945, 68255, 105947
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..20.
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
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(251*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A240623 A240624 A375091 * * A209871 A347702
Adjacent sequences: A032499 A032500 A032501 * A032503 A032504 A032505
KEYWORD
nonn,hard,changed
AUTHOR
N. J. A. Sloane.
STATUS
approved

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Last modified November 7 14:19 EST 2024. Contains 377535 sequences.
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