

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
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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^n1 (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 bfile, and more terms appended to bfile, by Jeppe Stig Nielsen, Jan 19 2020


STATUS

approved



