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 A139027 #2 Mar 30 2012 17:26:27 %S A139027 1292,3865,4666,8973,13936,50339,57266,67597,72316,85343,110934, %T A139027 132941,147990,220203,226652,270239,272950,313361,366186,375253, %U A139027 392090,409619,412024,415237,469982,511263,556808,635279,640716,654559,711018,721629 %N A139027 This is to A139026 as A139026 to A139025, see A139025 for details. %C A139027 Notice that a(n)-n is always prime by definition, e.g., %C A139027 a(1) - 1 = 1291, a(2) - 2 = 3863, a(3) - 3 = 4663, a(4) - 4 = 8969, etc. %Y A139027 Cf. A000027, A014688, A061068, A139025, A139026, A139028, A139029. %K A139027 nonn %O A139027 1,1 %A A139027 _Zak Seidov_, Apr 07 2008