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A032497 Numbers n such that 241*2^n+1 is prime. 1
36, 72, 288, 5528, 8904, 9876, 130992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

Ray Ballinger, Proth Search Page

Ray Ballinger & 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(241*2^n+1) \\ Charles R Greathouse IV, Jun 07 2017

CROSSREFS

Cf. A032373, A032419, A032460.

Sequence in context: A119843 A322657 A066216 * A024973 A024975 A025399

Adjacent sequences:  A032494 A032495 A032496 * A032498 A032499 A032500

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

EXTENSIONS

One more term (from the Ballinger-Keller web page) from M. F. Hasler, Apr 18 2007

STATUS

approved

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Last modified March 21 10:00 EDT 2019. Contains 321368 sequences. (Running on oeis4.)