OFFSET
1,1
COMMENTS
a(5) has 1452 digits. - Vincenzo Librandi, Feb 22 2015
The values of k are 2, 3, 7, 17, 661, ... - 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.
MATHEMATICA
Select[Table[157^n - 156^n, {n, 1000}], PrimeQ] (* Vincenzo Librandi, Feb 22 2015 *)
PROG
(Magma) [a: n in [0..600] | IsPrime(a) where a is 157^n-156^n]; // Vincenzo Librandi, Feb 22 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Michael P. May, Feb 21 2015
STATUS
approved