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 A039665 #9 May 18 2013 16:49:21 %S A039665 242,243,244,245,3655,3656,3657,3658,4503,4504,4505,4506,5943,5944, %T A039665 5945,5946,6853,6854,6855,6856,7256,7257,7258,7259,8392,8393,8394, %U A039665 8395,9367,9368,9369,9370,10983,10984,10985,10986,11605,11606,11607,11608 %N A039665 Sets of 4 consecutive numbers with equal number of divisors. %C A039665 Taking the first entry in each set gives A006601. %D A039665 D. Wells, Curious and interesting numbers, Penguin Books, p. 134 %Y A039665 Cf. A000005, A005237, A005238, A006601, A049051, A006558, A019273. %K A039665 nonn %O A039665 1,1 %A A039665 _Felice Russo_ %E A039665 More terms from _Patrick De Geest_, Nov 15 1999