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 A124081 #10 Sep 19 2022 06:15:56 %S A124081 3,5,7,11,17,43,179,467,8363,21893,35423,92737,392837,204668311, %T A124081 1402817467,40730022149,8105479075763,15080227609492692859, %U A124081 100190602496116782278655832523,26361745652748197675264382970030251614748343 %N A124081 Primes of the form 2*F(k) + 1. %H A124081 Amiram Eldar, <a href="/A124081/b124081.txt">Table of n, a(n) for n = 1..40</a> %F A124081 a(n) = 2*A000045(A124067(n+1)) + 1. - _Amiram Eldar_, Sep 19 2022 %t A124081 Select[Fibonacci@Range[2,300]*2+1,PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Jan 30 2012 *) %Y A124081 Cf. A000045, A124067. %K A124081 nonn %O A124081 1,1 %A A124081 _Giovanni Teofilatto_, Dec 12 2006