A259535 Numbers k such that 159^k - 158^k is prime.

2, 3, 17, 107, 13313

Offset: 1

Author

Michael P. May, Jun 29 2015

Keywords

• nonn
• more
• hard

Comments

a(5) is only a strong pseudoprime. - Tim Johannes Ohrtmann, Jun 20 2016

a(6) > 30000. - Michael S. Branicky, Oct 15 2024

Crossrefs

Cf. A254298.

Programs

Magma

[n: n in [0..1000] | IsPrime(159^n-158^n)]; // Vincenzo Librandi, Jul 01 2015

Mathematica

Select[Range[2000], PrimeQ[159^# - 158^#] &] (* Vincenzo Librandi, Jul 01 2015 *)

PARI

is(n)=ispseudoprime(159^n-158^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(4) from Vincenzo Librandi, Jul 01 2015

a(5) from Tim Johannes Ohrtmann, Jun 20 2016