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 A133973 #5 Apr 28 2015 14:57:40
%S A133973 77773,312619,359929,364627,374531,378997,379811,747521,749711,771941,
%T A133973 777643,1173463,1355021,1389281,1929311,1991153,2314723,2315641,
%U A133973 2333797,2336263,2337397,2337547,2337607,2337691,2339929,2373823,2389853
%N A133973 Home primes whose homeliness is greater than 9.
%C A133973 Number of terms < 10^n: 0, 0, 0, 0, 1, 11, 142, ....
%t A133973 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 A133973 d = 10 - 2; lsu = {}; Do[ If[ lst[[n]] == lst[[n + d]], AppendTo[ lsu, lst[[n]] ]], {n, 188004 - d - 1}]; Take[ Union@ lsu, 30]
%Y A133973 Cf. A037274, A118756, A133957, A133959, A133961, A133963, A133965, A133967, A133969, A133971, A133975, A133977, A133979.
%K A133973 nonn,base
%O A133973 1,1
%A A133973 _Robert G. Wilson v_, Sep 30 2007