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 A166685 #12 Mar 07 2020 22:14:43 %S A166685 1,5,17,19,29,31,41,43,49,51,53,55,65,67,69,71,77,79,89,91,97,99,101, %T A166685 103,109,111,113,115,125,127,129,131,137,139,149,151,153,155,161,163, %U A166685 169,171,173,175,181,183,185,187,189,191,197,199,209,211,221,223,229 %N A166685 Odd numbers that are the sum of two consecutive nonprimes. %H A166685 Harvey P. Dale, <a href="/A166685/b166685.txt">Table of n, a(n) for n = 1..1000</a> %e A166685 a(1)=0(1st nonprime)+1(2nd nonprime)=1(odd); %e A166685 a(2)=1(2nd nonprime)+4(3rd nonprime)=5(odd). %t A166685 Select[Total/@Partition[Select[Range[0,200],!PrimeQ[#]&],2,1],OddQ] (* _Harvey P. Dale_, Mar 07 2020 *) %Y A166685 Cf. A118134, A141468, A163467. %K A166685 nonn %O A166685 1,2 %A A166685 _Juri-Stepan Gerasimov_, Oct 18 2009 %E A166685 Entries checked by _R. J. Mathar_, Apr 24 2010