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A323108 Numbers k such that 417*2^k+1 is prime. 1
2, 4, 7, 8, 11, 12, 15, 16, 19, 24, 28, 51, 59, 62, 63, 64, 75, 79, 132, 338, 355, 518, 692, 806, 1287, 1618, 1803, 2715, 2743, 2834, 3055, 3255, 3323, 4067, 5255, 6094, 6254, 6796, 7063, 7476, 7787, 8067, 10795, 13342, 14407, 22292, 23132, 27076, 30286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..73 (terms n = 1..70 from Robert Price)

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(417*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 04 2019

MATHEMATICA

Select[Range[1000], PrimeQ[417*2^# + 1] &]

CROSSREFS

Sequence in context: A182654 A112648 A307284 * A187418 A161989 A229829

Adjacent sequences:  A323105 A323106 A323107 * A323109 A323110 A323111

KEYWORD

nonn,hard

AUTHOR

Robert Price, Jan 04 2019

STATUS

approved

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Last modified October 23 00:39 EDT 2021. Contains 348211 sequences. (Running on oeis4.)