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 A173607 #2 Mar 30 2012 19:00:22 %S A173607 1,4,60,277200 %N A173607 a(1) = 1, for n >= 2; a(n) = the smallest number h such that tau(h) = A000005(h) = 3 * a(n-1). %C A173607 The next term is too large to include. %F A173607 A000005(a(n)) = 3 * a(n-1) for n >= 2. %Y A173607 Cf. A014221, A173603, A173604, A173605, A173606, A173608, A173609, A171959, A173011. %K A173607 nonn %O A173607 1,2 %A A173607 _Jaroslav Krizek_, Nov 06 2010