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 A231407 #4 Nov 25 2013 02:59:43 %S A231407 1,4,6 %N A231407 Positive integers that are not the sum of distinct primes. %C A231407 Using elementary methods, Richert proved that 6 is the largest integer which is not the sum of distinct primes. %D A231407 H.-E. Richert, Über Zerlegungen in paarweise verschiedene Zahlen, Norsk. Mat. Tidsskr., 31 (1949), 120-122. %H A231407 R. E. Dressler, <a href="http://www.ams.org/journals/proc/1973-038-03/S0002-9939-1973-0309842-8/S0002-9939-1973-0309842-8.pdf">Addendum to "A stronger Bertrand’s postulate with an application to partitions"</a>, Proc. Am. Math. Soc., 38 (1973), 667. %F A231407 a(3) = A121571(1). %Y A231407 Cf. A121571, A231408. %K A231407 fini,full,nonn %O A231407 1,2 %A A231407 _Jonathan Sondow_, Nov 24 2013