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 A295990 #11 Dec 06 2017 04:57:07
%S A295990 315,494,603,873,1070,1358,1413,1525,1737,1845,1898,1989,2006,2145,
%T A295990 2265,2277,2485,2493,2546,2690,2694,2714,2782,3014,3033,3069,3302,
%U A295990 3356,3357,3478,3614,3681,3788,3789,4065,4364,4365,4490,4491,4525,4634,4922,4923,4965,5074,5138,5228,5229
%N A295990 Numbers n such that there are precisely 4 groups of orders n and n + 1.
%C A295990 Equivalently, lower member of consecutive terms of A054396.
%H A295990 Muniru A Asiru, <a href="/A295990/b295990.txt">Table of n, a(n) for n = 1..448</a>
%H A295990 H. U. Besche, B. Eick and E. A. O'Brien. <a href="http://dx.doi.org/10.1142/S0218196702001115">A Millennium Project: Constructing Small Groups</a>, Internat. J. Algebra and Computation, 12 (2002), 623-644.
%H A295990 Gordon Royle, <a href="http://staffhome.ecm.uwa.edu.au/~00013890/remote/cubcay/">Numbers of Small Groups</a>
%H A295990 <a href="/index/Gre#groups">Index entries for sequences related to groups</a>
%F A295990 Sequence is { n | A000001(n) = 4, A000001(n+1) = 4 }.
%e A295990 315 is in the sequence because A000001(315) = A000001(316) = 4, 494 is in the sequence because A000001(494) = A000001(495) = 4 and 2006 is in the sequence because A000001(2006) = A000001(2007) = 4.
%o A295990 (GAP) #A295990 := Filtered([1..2014], n -> [NumberSmallGroups(n), NumberSmallGroups(n+1)]=[4, 4]);
%Y A295990 Cf. A000001, A054396.
%K A295990 nonn
%O A295990 1,1
%A A295990 _Muniru A Asiru_, Dec 02 2017