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 A278637 #82 Feb 26 2023 20:39:59 %S A278637 3,4,5,7,8,9,10,11,13,14,17,19,22,23,26,29,31,34,41,43,47,53,59,61,71, %T A278637 73,79,83,89,94,101,107,109,113,121,127,131,137,151,167,173,191,193, %U A278637 199,227,251,271,277,293,331,353,359,397,401,431,433,449,467,509,569,571,587,599,601,613,631,653,743,991,1091,1223,1373,1487 %N A278637 Numbers k such that Fibonacci(k) is either prime or semiprime. %C A278637 Numbers k such that 2 <= A063375(k) <= 4. %C A278637 All numbers in the first 4 rows of A279021 are in this sequence (3, 5, 11, 17, 353, 431, 509, and 587). %C A278637 Are all numbers of A279021 in this sequence? %F A278637 A001605 U A072381. %Y A278637 Cf. A000045, A001605, A063375, A072381, A136341, A279021. %K A278637 nonn %O A278637 1,1 %A A278637 _Bobby Jacobs_, Jan 04 2017 %E A278637 a(31)-a(64) from _Charles R Greathouse IV_, Jan 04 2017 %E A278637 a(65)-a(73) from _Max Alekseyev_, Feb 26 2023