A050588 - OEIS

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A050588

Numbers n such that 125*2^n-1 is prime.

0

2, 4, 44, 182, 496, 904, 1196, 3034, 4004, 5474, 18122, 21952, 24874, 27614, 31166, 35386, 44234, 51104, 96346, 100966, 109454, 123634, 388934, 418034, 659314, 918494

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

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

Kosmaj, Riesel list k<300.

PROG

(PARI) is(n)=ispseudoprime(125*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A141142 A353797 A007596 * A217795 A105282 A348247

Adjacent sequences: A050585 A050586 A050587 * A050589 A050590 A050591

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane, Dec 29 1999

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

STATUS

approved