A255387 Primes of the form 141^k - 140^k.

281, 59221, 769449701919846533025514621

Offset: 1

Author

Michael P. May, Feb 21 2015

Keywords

• nonn

Comments

a(4) has 372 digits. - Vincenzo Librandi, Feb 22 2015

The values of k are 2, 3, 13, 173, ... - Jinyuan Wang, May 30 2020

Links

• Michael P. May, On the Existence and Frequency Distribution of the Shell Primes, arXiv preprint arXiv:1510.01028 [math.CO], 2015.

Crossrefs

Cf. A254298.

Programs

Magma

[a: n in [0..600] | IsPrime(a) where a is 141^n-140^n]; // Vincenzo Librandi, Feb 22 2015

Mathematica

Select[Table[141^n - 140^n, {n, 1000}], PrimeQ] (* Vincenzo Librandi, Feb 22 2015 *)

PARI

select(m->ispseudoprime(m), vector(20, k, 141^k-140^k)) \\ Jinyuan Wang, May 30 2020