A032423 - OEIS

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A032423

Numbers k such that 147*2^k+1 is prime.

1

8, 11, 15, 18, 19, 26, 44, 60, 84, 90, 91, 134, 155, 179, 258, 275, 475, 620, 824, 888, 1731, 2194, 2328, 2568, 2915, 3554, 4319, 5340, 8054, 10088, 21660, 41851, 50535, 77719, 81660, 169658, 179034, 190911, 208731, 218300, 359710, 394394, 509831, 534558

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..52

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

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

MAPLE

select(k->isprime(147*2^k+1), [$0..1000])[]; # Muniru A Asiru, Dec 18 2018

MATHEMATICA

Select[Range[1000], PrimeQ[147*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

PROG

(PARI) is(n)=ispseudoprime(147*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A188199 A078117 A256073 * A063724 A317770 A154685

Adjacent sequences: A032420 A032421 A032422 * A032424 A032425 A032426

KEYWORD

nonn

AUTHOR

James R. Buddenhagen

EXTENSIONS

a(36)-a(49) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

Terms moved from Data section to b-file, and more terms appended to b-file, by Jeppe Stig Nielsen, Jan 19 2020

STATUS

approved