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 A214894 #11 Jul 17 2015 00:24:49 %S A214894 10,18,14,16,15,31,23,27,25,26,17,43,30,73,103,88,191,93,142,47,63,55, %T A214894 59,57,58,23,27 %N A214894 Conway's subprime Fibonacci sequence starting with (10, 18). %C A214894 Similar to the Fibonacci recursion starting with (10, 18), but each new nonprime term is divided by its least prime factor. Sequence enters a loop of length 19 after 8 terms on reaching (23, 27). %H A214894 Richard K. Guy, Tanya Khovanova, and Julian Salazar, <a href="http://arxiv.org/abs/1207.5099">Conway's subprime Fibonacci sequences</a>, arXiv:1207.5099 [math.NT] %t A214894 see A214674 %Y A214894 Cf. A000045, A020639, A175723, A214551, A014682, A214674, A214892-A214898. %K A214894 nonn %O A214894 1,1 %A A214894 _Wouter Meeussen_, Jul 29 2012