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 A379054 #18 Dec 18 2024 16:34:38 %S A379054 3,3,3,3,3,3,2,2,4,2,2,3,3,3,3,2,2,3,2,3,3,2,3,2,4,2,2,3,3,2,2,3,2,2, %T A379054 3,2,4,2,4,2,3,2,2,2,2,2,3,2,3,2,3,3,2,2,2,3,3,2,3,2,2,3,3,2,2,3,2,3, %U A379054 3,2,2,2,3,3,3,3,2,2,2,2,3,2,2,2,2,2,3,3,3,3 %N A379054 a(n) = composite(2*n+2) - composite(2*n). %C A379054 A121053 is divided into blocks, and (ignoring the initial terms of A121053) these are the lengths of the blocks. %H A379054 Paolo Xausa, <a href="/A379054/b379054.txt">Table of n, a(n) for n = 1..10000</a> %t A379054 Differences[Select[Range[300], CompositeQ][[2 ;; ;; 2]]] (* _Paolo Xausa_, Dec 18 2024 *) %Y A379054 First differences of A099862. %Y A379054 Cf. A002808, A099861, A121053, A379055. %K A379054 nonn %O A379054 1,1 %A A379054 _N. J. A. Sloane_, Dec 18 2024