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 A082420 #8 Dec 05 2012 23:50:02 %S A082420 4,12,16,18,36,40,42,48,50,54,60,64,66,72,75,85,96,100,108,112,117, %T A082420 121,128,136,150,154,156,162,180,182,184,192,196,210,217,228,240,243, %U A082420 245,250,256,264,266,270,276,280,282,290,294,297,301,308,312,320,325,330,333,336 %N A082420 Numbers n such that P(n) < P(n+2) < P(n+1), where P(n) = largest prime factor of n (A006530). %D A082420 Antal Balog, On the largest prime factor of consecutive integers, Abstracts Amer. Math. Soc., 25 (No. 2, 2002), p. 337, #975-11-76. %H A082420 T. D. Noe, <a href="/A082420/b082420.txt">Table of n, a(n) for n = 1..1000</a> %H A082420 P. Erdős and C. Pomerance, <a href="http://www.math.dartmouth.edu/~carlp/PDF/paper17.pdf">On the largest prime factors of n and n+1</a>, Aequationes Math. 17 (1978), p. 311-321. [<a href="http://www.renyi.hu/~p_erdos/1978-29.pdf">alternate link</a>] %Y A082420 Cf. A006530, A082417-A082422, A071869, A071870. %K A082420 nonn %O A082420 1,1 %A A082420 _N. J. A. Sloane_, Apr 25 2003