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 A171469 #11 May 19 2019 20:37:58
%S A171469 0,1,4,27,117,121,125,135,147,171,189,207,245,255,261,275,289,297,325,
%T A171469 343,345,357,363,387,405,425,429,455,475,477,483,495,507,513,529,531,
%U A171469 539,555,561,567,575,585,605,625,627,637,639,651,657,665,705,715,725,747,765,777
%N A171469 Nonnegative nonprimes which are neither the sum nor the product of two distinct primes.
%t A171469 prs=Prime[Range[150]];
%t A171469 prodprs=Times@@@Subsets[prs,{2}];
%t A171469 sumprs=Plus@@@Subsets[prs,{2}];
%t A171469 Complement[Range[0,800],prs,prodprs,sumprs] (* _Harvey P. Dale_, Jan 23 2011 *)
%Y A171469 Cf. A000040, A166081, A109934, A141468, A006881.
%K A171469 nonn
%O A171469 1,3
%A A171469 _Juri-Stepan Gerasimov_, Dec 09 2009
%E A171469 Definition clarified, sequence corrected (51 removed, 289 inserted) and extended by _R. J. Mathar_, Apr 24 2010