A319486 - OEIS

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A319486

Numbers k such that 475*2^k+1 is prime.

0

2, 26, 38, 100, 340, 686, 2062, 2786, 26698, 40330, 377668, 447826, 759412, 1269578, 2403220

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

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

MATHEMATICA

Select[Range[1000], PrimeQ[475*2^# + 1] &]

CROSSREFS

Sequence in context: A276176 A050905 A067571 * A084298 A001772 A199206

Adjacent sequences: A319483 A319484 A319485 * A319487 A319488 A319489

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Jan 07 2019

EXTENSIONS

a(15) from Jeppe Stig Nielsen, Jan 04 2020

STATUS

approved