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 A248887 #12 Jun 19 2015 08:56:25 %S A248887 677,6635777,28132417,156400037,234518597,381655297,386751557, %T A248887 403849217,820020497,1215498497,1298449157,1539463697,1580539537, %U A248887 1839037457,2072616677,2774550277,2969814017,6147500837,6194319617,6703351877,6937890437 %N A248887 Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime. %C A248887 All terms == 7 mod 10. Subsequence of A121834. %Y A248887 Cf. A001912, A121326. %K A248887 nonn %O A248887 1,1 %A A248887 _Zak Seidov_, Mar 05 2015