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 A120335 #6 Mar 30 2012 18:36:04 %S A120335 79600343456925208350554324952070658488321, %T A120335 67727051825754224132985695308485992267126791150081, %U A120335 17096333467784942360991864487916588941402614691799041 %N A120335 CRF(13): consecutive refactorable numbers (rf, rf-1 are refactorable) such that 13 is the smallest prime divisor of rf. %C A120335 The sequence has prime factorization (13*197)^12, (13*1093)^12, (13*1733)^12, (13*17*139)^12, (13*7877)^12, (13*16069)^12. %F A120335 a(n) = is the n-th number rf such that both rf and rf-1 are refactorable and 13 is the smallest prime divisor of rf. %e A120335 a(1)=(13*197)^12 is the first number rf such that rf refactorable, 13 is the smallest prime of rf and rf-1 is refactorable. %Y A120335 Cf. A033950, A036898, A114617. %K A120335 nonn,bref %O A120335 1,1 %A A120335 _Walter Kehowski_, Jun 22 2006