A323198 Numbers k such that 457*2^k+1 is prime.

8, 28, 34, 70, 90, 158, 280, 320, 448, 1240, 3700, 6608, 7508, 23514, 34144, 74760, 118920, 131668, 353700, 863568, 915684

Offset

1,1

Links

Table of n, a(n) for n=1..21.

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[457*2^# + 1] &]

Crossrefs

Sequence in context: A184614 A006377 A319233 * A121739 A166729 A202290

Adjacent sequences: A323195 A323196 A323197 * A323199 A323200 A323201

Keyword

nonn,more,hard

Author

Robert Price, Jan 06 2019

Status

approved