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 A087835 #4 Oct 19 2017 03:14:23 %S A087835 341,1065,1559,1735,2610 %N A087835 a(n)*primorial(2777)-1 is prime. %C A087835 The "2777" sequence has rather few small terms. %Y A087835 Cf. A002110, A087730-2, A087832, 3, 5, 7. %K A087835 nonn %O A087835 0,1 %A A087835 _Pierre CAMI_, Oct 07 2003 %E A087835 Edited by _Don Reble_, Nov 09 2005