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 A227627 #27 Nov 06 2024 10:19:26 %S A227627 2,3,5,7,13,25,29,37,47,67,457,2309,2383,4133,5023,8059 %N A227627 Numbers k such that F(5*k)/(5*F(k)) is prime, where F(m) is the m-th Fibonacci number. %C A227627 Except for k = 25, all other terms k are primes. Conjecture: this sequence is infinite. - _Thomas Ordowski_, Jul 18 2013 %C A227627 a(17) > 50000. - _Michael S. Branicky_, Nov 06 2024 %t A227627 Select[Range[1000],PrimeQ[Fibonacci[5*#]/Fibonacci[#]/5]&] %o A227627 (PARI) is(n)=ispseudoprime(fibonacci(5*n)/fibonacci(n)/5) \\ _Charles R Greathouse IV_, Nov 25 2014 %Y A227627 Cf. A227576, A088545, A000045, A001605. %K A227627 nonn,more,hard %O A227627 1,1 %A A227627 _Vaclav Kotesovec_, Jul 18 2013