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A058781 Numbers n such that n^2 * 2^n - 1 is prime. 2
3, 7, 25, 41, 45, 63, 83, 131, 147, 175, 425, 449, 469, 651, 1345, 1839, 1883, 1913, 2177, 2551, 2907, 3675, 6071, 11743, 14641, 38685, 40857, 47761, 97243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..29.

Steven Harvey, Generalized HyperWoodall Primes

MATHEMATICA

Do[ If[ PrimeQ[ n^2*2^n - 1 ], Print[n] ], {n, 1, 5000} ]

PROG

(PARI) is(n)=ispseudoprime(n^2*2^n-1) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Sequence in context: A031875 A157817 A118718 * A100462 A161637 A329969

Adjacent sequences:  A058778 A058779 A058780 * A058782 A058783 A058784

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jan 02 2001

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008

STATUS

approved

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Last modified February 28 09:06 EST 2020. Contains 332323 sequences. (Running on oeis4.)