A032422 Numbers k such that 145*2^k+1 is prime.

6, 16, 28, 70, 76, 250, 276, 312, 562, 636, 1366, 1552, 1968, 7000, 7312, 7548, 7852, 8116, 16306, 18868, 20518, 23676, 27400, 75858, 207880, 1233286, 2621020, 4327756

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Mathematica

Select[Range[1000], PrimeQ[145*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

Prog

(PARI) is(n)=ispseudoprime(145*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A201020 A088818 A346620 * A164052 A264938 A350011

Adjacent sequences: A032419 A032420 A032421 * A032423 A032424 A032425

Keyword

nonn,more

Author

James R. Buddenhagen

Extensions

a(25)-a(26) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

a(27) from Jeppe Stig Nielsen, Mar 12 2020

a(28) from Jeppe Stig Nielsen, Dec 23 2024

Status

approved