A050544 - OEIS

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A050544

Numbers k such that 37*2^k-1 is prime.

1

1, 2553, 4893, 7897, 14353, 32125, 51477, 78973, 341365

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

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(37*2^n-1) \\ Charles R Greathouse IV, Jun 12 2017

CROSSREFS

Cf. A050412, A050413.

Sequence in context: A035876 A072435 A050413 * A185516 A235085 A252685

Adjacent sequences: A050541 A050542 A050543 * A050545 A050546 A050547

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane, Dec 29 1999

EXTENSIONS

More terms from David Broadhurst, Dec 29 1999

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

STATUS

approved