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 A133968 #11 Mar 23 2021 15:42:11
%S A133968 23251,23761,33797,36389,37643,37951,37967,77711,113779,131777,132749,
%T A133968 134129,233347,233617,233881,237547,293863,311677,311821,313619,
%U A133968 314627,317743,319547,331319,331907,333139,333271,333457,333791,333911,337517
%N A133968 Home primes whose homeliness is 7.
%C A133968 Number of terms < 10^n: 0, 0, 0, 0, 8, 80, 667, ... .
%t A133968 lst = {}; f[n_] := FromDigits@ Flatten[ IntegerDigits@ Table[ #[[1]], {#[[2]]}] & /@ FactorInteger@n, 2]; h[n_] := NestWhileList[f@# &, n, !PrimeQ@# &, 1, 28]; Do[p = h[n][[ -1]]; If[ PrimeQ@p && p < 10^7 && p != n, Print[{n, p}]; AppendTo[lst, p]], {n, 2, 1000}];
%t A133968 d = 7 - 2; lsu = {}; Do[ If[ lst[[n]] == lst[[n + d]] && lst[[n - 1]] != lst[[n]] && lst[[n]] != lst[[n + d + 1]], AppendTo[lsu, lst[[n]]]], {n, 188004 - d - 1}]; Take[Union@ lsu, 35]
%Y A133968 Cf. A037274, A118756, A133967, A133956, A133957, A133958, A133960, A133962, A133964, A133966, A133970, A133972, A133974, A133976, A133978.
%K A133968 nonn,base
%O A133968 1,1
%A A133968 _Robert G. Wilson v_, Sep 30 2007