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 A176556 #3 Mar 30 2012 19:00:24 %S A176556 1,12,124,15,1236,1248,12510,111,1234612,12714,13515,124816,117, %T A176556 1236918,119,12451020,121122,123,1234681224,1525,121326,13927, %U A176556 12471428,129,12356101530,12481632,131133,121734,15735,123469121836,121938,131339 %N A176556 Nonprime concatenations of divisors of some k, ordered by k. %C A176556 Intersection of A037278 and A018252. %F A176556 a(n) = A037278(A176554(n)). %e A176556 For n = 6; a(6) = 1248 because A176554(6) = 8 and divisors of 8 are 1, 2, 4, 8; concatenation of divisors A037278(8) = 1248 is nonprime number. %K A176556 nonn,base %O A176556 1,2 %A A176556 _Jaroslav Krizek_, Apr 20 2010 %E A176556 Extended and edited by _Charles R Greathouse IV_, Apr 27 2010