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A254298
Primes of the form 120^k - 119^k.
7
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
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
KEYWORD
nonn
AUTHOR
Michael P. May, Jan 27 2015
STATUS
approved