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 A140235 #7 Aug 22 2021 18:18:51
%S A140235 1,3,6,11,18,26,37,49,62,78,95,113,132,152,175,199,226,254,283,313,
%T A140235 344,376,412,449,489,530,572,615,659,704,751,799,849,901,954,1008,
%U A140235 1064,1123,1183,1244,1307,1371,1437,1504,1572,1642,1713,1785,1858,1933,2009
%N A140235 Partial sum of non-semiprimes A100959.
%C A140235 This is to semiprimes A001358 as A051352 is to primes A000040. Equivalently, this is to non-semiprimes A100959 as A051349 is to nonprimes A018252.
%F A140235 a(n) = Sum{k=1..n} A100959(k).
%e A140235 a(5) = 18 = 1 + 2 + 3 + 5 + 7.
%t A140235 Accumulate[Select[Range[100],PrimeOmega[#]!=2&]] (* _Harvey P. Dale_, Aug 22 2021 *)
%Y A140235 Cf. A000217, A001358, A018252, A034387, A051349, A051352, A062198, A072000, A100959, A140234.
%K A140235 easy,nonn
%O A140235 1,2
%A A140235 _Jonathan Vos Post_, May 13 2008
%E A140235 Corrected and edited by _Giovanni Resta_, Jun 20 2016