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 A092947 #4 Dec 05 2013 19:56:46 %S A092947 3,5,181,2521,552553,39070081,4180176001,1483048828801, %T A092947 672375473078401,106890247271808001,40812700642879334401, %U A092947 37716399337002946560001,18266163370859189769984001,9553876078552184850831360001 %N A092947 Group the natural numbers so that the n-th group contains n numbers whose sum as well as the group product +1 is prime. Sequence contains the primes arising as the product of the terms of groups +1. %C A092947 See A092944 for additional clarification of definition. %Y A092947 Cf. A092944, A092945, A092946. %K A092947 nonn %O A092947 1,1 %A A092947 _Amarnath Murthy_, Mar 23 2004 %E A092947 Edited, corrected and extended by _Ray Chandler_, May 07 2008