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 A092945 #7 Dec 05 2013 19:56:46 %S A092945 2,4,10,9,23,28,29,47,115,71,88,214,215,188,341,133,220,372,250,321, %T A092945 227,311,281,310,592,857,691,406,470,483,904,903,707,601,876,727,726, %U A092945 1299,828,925,1217,1254,963,1426,1213,1394,2108,1356,1448,1286,1564,1455 %N A092945 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 last term of each group. %C A092945 Sequence is underdefined. The original author may have intended to say that the terms must be distinct and minimal; perhaps he should clarify. - _Jonathan Vos Post_, Mar 22 2006 %C A092945 See A092944 for additional clarification of definition. %e A092945 a(6) = 28 because 15+16+17+18+19+28 = 113 is prime and 15*16*17*18*19*28 + 1 = 39070081 is prime. %Y A092945 Cf. A092944, A092946, A092947. %K A092945 nonn %O A092945 1,1 %A A092945 _Amarnath Murthy_, Mar 23 2004 %E A092945 a(6) from _Jonathan Vos Post_, Mar 22 2006 %E A092945 Edited and extended by _Ray Chandler_, May 07 2008