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 A031331 #6 Jan 28 2015 15:06:10 %S A031331 25,43,45,51,59,63,65,80,105,107,135,159,161,168,179,188,195,227,250, %T A031331 253,268,270,278,301,309,311,326,344,351,353,360,369,375,403,418,433, %U A031331 448,450,457,493,504,505,511,535,559,563,581 %N A031331 Position of n-th 6 in A031324. %t A031331 Flatten[Position[Flatten[IntegerDigits/@Fibonacci[Range[0,90]]],6]]-2 (* _Harvey P. Dale_, Jan 28 2015 *) %K A031331 nonn %O A031331 1,1 %A A031331 _Clark Kimberling_