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 A335976 #31 May 27 2024 23:01:20 %S A335976 0,11,13,17,29,31,41,43,47,53,61,71,73,79,81,83,89,97,101,103,107,113, %T A335976 121,131,137,139,141,149,151,157,167,173,191,193,199,223,229,233,239, %U A335976 241,243,257,263,271,281,283,293,311,313,317,321,331,339,347,349,353,373,389,397,401,419,421,431,433,443,449,457,461,479,487,509,521,541,557,573,577,587,599,613,617,619,631,641,643,653,661,673,733,739 %N A335976 Numbers k such that Fibonacci(6*k) is not a totient. %C A335976 Conjecture: Sequence contains infinitely many primes. %e A335976 11 is a term since Fibonacci(66) = 27777890035288 is not a totient number. %o A335976 (PARI) isok(n) = !istotient(fibonacci(6*n)) %Y A335976 Cf. A000010, A007617, A134492, A280592, A280681. %K A335976 nonn %O A335976 1,2 %A A335976 _Altug Alkan_, Jul 03 2020 %E A335976 a(12)-a(20) from _Max Alekseyev_, Aug 02 2020 %E A335976 Terms a(21) onward from _Max Alekseyev_, May 19 2024