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 A255390 #16 Sep 08 2022 08:46:11
%S A255390 89269,184438202074309,
%T A255390 379889466040169687349246148321558634248221737128245658182879616485078366262882828905566134219669
%N A255390 Primes of the form 173^k - 172^k.
%C A255390 a(4) has 1569 digits, a(5) has 2030 digits. - _Vincenzo Librandi_, Feb 22 2015
%C A255390 The values of k are 3, 7, 43, 701, 907, ... - _Jinyuan Wang_, May 30 2020
%H A255390 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 A255390 Select[Table[173^n - 172^n, {n, 1000}], PrimeQ] (* _Vincenzo Librandi_, Feb 22 2015 *)
%o A255390 (Magma) [a: n in [0..200] | IsPrime(a) where a is (173^n-172^n)]; // _Vincenzo Librandi_, Feb 22 2015
%o A255390 (PARI) select(m->ispseudoprime(m), vector(100, k, 173^k-172^k)) \\ _Jinyuan Wang_, May 30 2020
%Y A255390 Cf. A254298.
%K A255390 nonn
%O A255390 1,1
%A A255390 _Michael P. May_, Feb 21 2015