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 A176555 #3 Mar 30 2012 19:00:24 %S A176555 1,13,17,139,113,13721,131,137,167,173,179,197,1103,1109,111121,1151, %T A176555 1163,1181,1361183,1193,1373219,1223,1229,1379237,1277,1283,1307, %U A176555 131133121363,1367,1373,13127381,1409,1433,1439,13157471,1487,13163489 %N A176555 Noncomposite concatenations of divisors of some k, ordered by k. %C A176555 Intersection of A037278 and A018252. %F A176555 a(n) = A037278(A176553(n)). %e A176555 For n = 6; a(6) = 13721 because A176553(6) = 21, and divisors of 21 are 1, 3, 7, 21; concatenation of divisors A037278(21) = 13721 is noncomposite number. %K A176555 nonn,base %O A176555 1,2 %A A176555 _Jaroslav Krizek_, Apr 20 2010 %E A176555 Extended and edited by _Charles R Greathouse IV_, Apr 27 2010