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 A084726 #10 Aug 25 2014 12:20:34 %S A084726 1,1,1,3,7,5,5,5,7,7,1,7,11,3,41,15,21,25,11,3,69,5,87,35,17,27,1,27, %T A084726 5,9,3,53,9,21,25,9,1,57,15,19,1,21,191,19,25,149,83,23,7,121,205,133, %U A084726 185,39,43,23,9,9,3,257,109,25,107,65,19,43,97,115,197,89,109,55,1,161,61 %N A084726 Smallest common difference of the arithmetic progression of length n, beginning with 1 whose product of first n terms + 1 is a prime. %C A084726 Obviously all the terms are odd. %e A084726 The arithmetic progression in triangular form: %e A084726 1 %e A084726 1 2 %e A084726 1 2 3 %e A084726 1 4 7 10 %e A084726 1 8 15 22 29 %e A084726 1 6 11 16 21 26 %e A084726 ... %Y A084726 Cf. A084727. %K A084726 nonn %O A084726 1,4 %A A084726 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 13 2003 %E A084726 More terms from _David Wasserman_, Jan 03 2005 %E A084726 Example triangle corrected by _Nathaniel Johnston_, Jun 25 2011