A217353 Numbers k such that 8^k - 3 is prime.

1, 2, 3, 4, 8, 50, 58, 71, 112, 1079, 1318, 2252, 3524, 4800, 5560, 6919, 11484, 12184, 41099, 94711, 375460, 449248

Offset: 1

Author

Vincenzo Librandi, Oct 02 2012

Keywords

• nonn
• more

Comments

3*A217353 is a subsequence of A050414. - Bruno Berselli, Oct 02 2012

Crossrefs

Cf. A050414, A059266, A217354.

Programs

Mathematica

Select[Range[5000], PrimeQ[8^# - 3] &]

PARI

is(n)=ispseudoprime(8^n-3) \\ Charles R Greathouse IV, May 22 2017

Extensions

a(15)-a(17), a(19)-a(20) using A050414 by Bruno Berselli, Oct 02 2012

a(18), a(21)-a(22) using A050414 by Michael S. Branicky, Sep 15 2024