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

281, 59221, 769449701919846533025514621

Offset

1,1

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

Table of n, a(n) for n=1..3.

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

Mathematica

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

Prog

(Magma) [a: n in [0..600] | IsPrime(a) where a is 141^n-140^n]; // Vincenzo Librandi, Feb 22 2015
(PARI) select(m->ispseudoprime(m), vector(20, k, 141^k-140^k)) \\ Jinyuan Wang, May 30 2020

Crossrefs

Cf. A254298.

Sequence in context: A270964 A185710 A242982 * A320706 A356854 A114804

Adjacent sequences: A255384 A255385 A255386 * A255388 A255389 A255390

Keyword

nonn

Author

Michael P. May, Feb 21 2015

Status

approved