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 A255387 #19 Sep 08 2022 08:46:11
%S A255387 281,59221,769449701919846533025514621
%N A255387 Primes of the form 141^k - 140^k.
%C A255387 a(4) has 372 digits. - _Vincenzo Librandi_, Feb 22 2015
%C A255387 The values of k are 2, 3, 13, 173, ... - _Jinyuan Wang_, May 30 2020
%H A255387 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 A255387 Select[Table[141^n - 140^n, {n, 1000}], PrimeQ] (* _Vincenzo Librandi_, Feb 22 2015 *)
%o A255387 (Magma) [a: n in [0..600] | IsPrime(a) where a is 141^n-140^n]; // _Vincenzo Librandi_, Feb 22 2015
%o A255387 (PARI) select(m->ispseudoprime(m), vector(20, k, 141^k-140^k)) \\ _Jinyuan Wang_, May 30 2020
%Y A255387 Cf. A254298.
%K A255387 nonn
%O A255387 1,1
%A A255387 _Michael P. May_, Feb 21 2015