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 A139028 #2 Mar 30 2012 17:26:27 %S A139028 270240,375255,635282,1000695,2039428,2602013,3398274,3748771,4300120, %T A139028 4889577,5643252,6595775,8684760,12489373,12758734,15186995,15557178, %U A139028 17151151,17988320,18564859,19878764,20317745,21560274,22466983 %N A139028 This is to A139027 as A139027 to A139026, see A139025 for details. %C A139028 Notice that a(n)-n is always prime by definition, e.g., %C A139028 a(1) - 1 = 270239, a(2) - 2 = 375253, a(3) - 3 = 635279, a(4) - 4 = 1000691, etc. %Y A139028 Cf. A000027, A014688, A061068, A139025, A139026, A139027, A139029. %K A139028 nonn %O A139028 1,1 %A A139028 _Zak Seidov_, Apr 07 2008