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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
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Eric Weisstein's World of Mathematics, Proth Prime
MATHEMATICA
Select[Range[1000], PrimeQ[475*2^# + 1] &]
CROSSREFS
Sequence in context: A276176 A050905 A067571 * A084298 A001772 A199206
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 07 2019
EXTENSIONS
a(15) from Jeppe Stig Nielsen, Jan 04 2020
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)