A254298 Primes of the form 120^k - 119^k.

239, 42841, 20386538221561, 110287289683553081554913641

Offset

1,1

Comments

a(5) has 164 digits, a(6) has 726 digits, a(7) has 826 digits. - Vincenzo Librandi, Feb 22 2015

The values of k are 2, 3, 7, 13, 79, 349, 397, 1279, ... - Jinyuan Wang, May 30 2020

Links

Jinyuan Wang, Table of n, a(n) for n = 1..7

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

Mathematica

Select[Table[120^n - 119^n, {n, 1000}], PrimeQ] (* Vincenzo Librandi, Feb 22 2015 *)

Prog

(Magma) [a: n in [0..100] | IsPrime(a) where a is 120^n-119^n]; // Vincenzo Librandi, Feb 22 2015

Crossrefs

Cf. A215538.

Sequence in context: A163041 A069364 A163052 * A181855 A223741 A223724

Adjacent sequences: A254295 A254296 A254297 * A254299 A254300 A254301

Keyword

nonn

Author

Michael P. May, Jan 27 2015

Status

approved