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 A175320 #5 Oct 13 2012 00:23:53 %S A175320 1,2,3,4,6,7,9,10,12,13,14,15,16,17,19,20,22,23,24,25,26,27,28,29,30, %T A175320 33,34,36,37,38,39,40,41,42,43,44,46,47,48,49,50,51,52,53,54,55,56,57, %U A175320 58,60,61,62,63,64,65,67,68,70,71,72,73,74,75,76,77,78,80,81,82,83,84,85 %N A175320 Positive integers which cannot be represented as half-sums (averages) of two primes with indices that are primes with prime indices. %C A175320 Appears to be finite with the last term being a(1578727)=161352166. If a(1578728) exists, it is greater than 10^9. %C A175320 The (apparently) last 19 terms are listed in A175321. %C A175320 Computed at the suggestion of _Jonathan Vos Post_. %H A175320 J. S. Kimberley, <a href="/A175320/b175320.txt">Table of n, a(n) for n=1..1578727</a> %F A175320 The complement of A175319. %Y A175320 Cf. A174682. %K A175320 nonn %O A175320 1,2 %A A175320 _Jason Kimberley_, Apr 04 2010