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 A253781 #7 Jan 16 2015 10:19:02 %S A253781 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,23,25,26,27,28, %T A253781 29,30,31,33,34,35,36,37,38,39,41,42,43,44,45,46,47,49,50,51,52,53,54, %U A253781 55,57,58,59,60,61,62,63,65,66,67,68,69,70,71,73,74,75,76,77,78,79,82,83,84,85,86,87,89,90,91,92,93,94,95,97,98,99,100 %N A253781 Numbers n for which A075167(n) = A252464(n). %H A253781 Antti Karttunen, <a href="/A253781/b253781.txt">Table of n, a(n) for n = 1..10000</a> %o A253781 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A253781 (define A253781 (ZERO-POS 1 1 (lambda (n) (- (A075167 n) (A252464 n))))) %Y A253781 Complement: A253782. %Y A253781 Subsequence: A005117 (squarefree numbers). %Y A253781 Cf. A075167, A252464. %K A253781 nonn %O A253781 1,2 %A A253781 _Antti Karttunen_, Jan 16 2015