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 A075776 #18 Jun 26 2022 03:08:59 %S A075776 2,3,4,5,6,7,8,9,13,16,17,19,23,31,32,43,47,57,59,61,71,79,83,87,101, %T A075776 109,129,137,151,161,183,187,191,199,213,221,247,251,271,311,347,381, %U A075776 391,393,433,493,497,499,599,749,767,827,839,913,943,983,991,1017,1027 %N A075776 Numbers k that do not divide phi(Fibonacci(k)). %H A075776 Amiram Eldar, <a href="/A075776/b075776.txt">Table of n, a(n) for n = 1..65</a> %t A075776 Select[Range[200], !Divisible[EulerPhi[Fibonacci[#]], #] &] (* _Amiram Eldar_, Jun 26 2022 *) %o A075776 (PARI) isok(n) = eulerphi(fibonacci(n)) % n; \\ _Michel Marcus_, Nov 29 2013 %Y A075776 Cf. A000010, A000045, A065449. %K A075776 nonn %O A075776 1,1 %A A075776 _Benoit Cloitre_, Oct 09 2002 %E A075776 More terms from _Michel Marcus_, Nov 29 2013 %E A075776 a(43)-a(59) from _Amiram Eldar_, Jun 26 2022