This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A254298 #34 Sep 08 2022 08:46:11
%S A254298 239,42841,20386538221561,110287289683553081554913641
%N A254298 Primes of the form 120^k - 119^k.
%C A254298 a(5) has 164 digits, a(6) has 726 digits, a(7) has 826 digits. - _Vincenzo Librandi_, Feb 22 2015
%C A254298 The values of k are 2, 3, 7, 13, 79, 349, 397, 1279, ... - _Jinyuan Wang_, May 30 2020
%H A254298 Jinyuan Wang, <a href="/A254298/b254298.txt">Table of n, a(n) for n = 1..7</a>
%H A254298 Michael P. May, <a href="https://arxiv.org/abs/1510.01028">On the Existence and Frequency Distribution of the Shell Primes</a>, arXiv preprint arXiv:1510.01028 [math.CO], 2015.
%t A254298 Select[Table[120^n - 119^n, {n, 1000}], PrimeQ] (* _Vincenzo Librandi_, Feb 22 2015 *)
%o A254298 (Magma) [a: n in [0..100] | IsPrime(a) where a is 120^n-119^n]; // _Vincenzo Librandi_, Feb 22 2015
%Y A254298 Cf. A215538.
%K A254298 nonn
%O A254298 1,1
%A A254298 _Michael P. May_, Jan 27 2015