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A323003 Numbers k such that 357*2^k+1 is prime. 1
2, 3, 7, 8, 10, 14, 18, 23, 26, 27, 35, 44, 46, 50, 55, 56, 59, 67, 80, 115, 138, 248, 280, 319, 372, 416, 454, 624, 662, 686, 702, 707, 806, 847, 866, 1422, 1930, 2115, 2835, 3283, 3358, 3510, 4420, 9284, 10007, 10990, 13775, 14466, 14558, 16099, 16319 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..77

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600

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

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Eric Weisstein's World of Mathematics, Proth Prime

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

MAPLE

select(k->isprime(357*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 02 2019

MATHEMATICA

Select[Range[1000], PrimeQ[357*2^# + 1] &] (* Robert Price, Jan 01 2019 *)

CROSSREFS

Sequence in context: A028808 A029718 A206821 * A051468 A002274 A287675

Adjacent sequences:  A322998 A323001 A323002 * A323004 A323005 A323006

KEYWORD

nonn,hard

AUTHOR

Robert Price, Jan 01 2019

STATUS

approved

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Last modified August 19 04:10 EDT 2019. Contains 326109 sequences. (Running on oeis4.)