A050540 - OEIS

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A050540

Numbers n such that 29*2^n-1 is prime.

1

4, 16, 76, 148, 184, 11008, 147316, 644044, 1478344

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OFFSET

1,1

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(29*2^n-1) \\ Charles R Greathouse IV, Jun 12 2017

CROSSREFS

Cf. A032364 = 29*2^n+1 is prime.

Sequence in context: A301577 A324171 A204772 * A346662 A094559 A199214

Adjacent sequences: A050537 A050538 A050539 * A050541 A050542 A050543

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane, Dec 29 1999

EXTENSIONS

One more term from Hugo Pfoertner, Aug 29 2004

1478344 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

STATUS

approved