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 A023176 #12 Jul 24 2021 08:40:34 %S A023176 1,2,3,5,8,10,20,21,32,55,80,95,104,145,155,165,205,247,295,305,320, %T A023176 355,395,437,445,505,545,605,655,667,695,745,755,895,905,955,987,995, %U A023176 1055,1145,1195,1205,1255,1345,1355,1405,1435,1555,1615,1655,1705,1745,1795 %N A023176 Numbers k such that Fibonacci(k) == 5 (mod k). %H A023176 Charles R Greathouse IV, <a href="/A023176/b023176.txt">Table of n, a(n) for n = 1..10000</a> %o A023176 (PARI) is(n)=((Mod([1,1;1,0],n))^n)[1,2]==5 \\ _Charles R Greathouse IV_, May 29 2013 %Y A023176 Cf. A000045. %K A023176 nonn %O A023176 1,2 %A A023176 _David W. Wilson_