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 A216429 #12 Jun 21 2022 04:29:00 %S A216429 0,1,2,6,12,13,17,19,24,29,31,34,38,47,83,102,109,127,131,193,271,307, %T A216429 323,397,419,431,433,449,461,467,479,493,509,614,643,646,653,673,899, %U A216429 1069,1091,1346 %N A216429 Numbers k such that the k-th Fibonacci number can be written in the form a^2 + 7*b^2. %C A216429 These Fibonacci numbers F(k) have no prime factors congruent to 3, 5 or 6 (mod 7) to an odd power. Also the power of 2 is not 1. %H A216429 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a> %Y A216429 Cf. A020670. %K A216429 nonn %O A216429 1,3 %A A216429 _V. Raman_, Sep 08 2012