A323194 Numbers k such that 449*2^k+1 is prime.

3, 5, 17, 25, 53, 65, 75, 93, 227, 263, 265, 455, 627, 805, 1187, 1253, 3345, 6377, 11465, 11977, 12317, 25097, 34683, 42097, 113387, 139585, 186287, 214323, 1093035

Offset

1,1

Links

Table of n, a(n) for n=1..29.

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[449*2^# + 1] &]

Crossrefs

Sequence in context: A255401 A364959 A263811 * A024867 A025111 A253204

Adjacent sequences: A323191 A323192 A323193 * A323195 A323196 A323197

Keyword

nonn,more,hard

Author

Robert Price, Jan 06 2019

Status

approved