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 A280508 #5 Jan 10 2017 19:14:45 %S A280508 0,0,0,0,0,0,0,0,0,0,0,6,0,6,0,0,0,0,0,10,0,0,12,10,0,10,12,0,0,10,0, %T A280508 0,0,0,0,18,0,12,20,30,0,12,0,30,24,0,20,18,0,18,20,0,24,30,0,12,0,30, %U A280508 20,12,0,18,0,0,0,0,0,34,0,20,36,54,0,0,24,34,40,20,60,54,0,20,24,54,0,0,60,34,48,20,0,54,40,0,36,34,0,34,36,0,40,54,0,20,48 %N A280508 a(n) = n XOR A057889(n). %H A280508 Antti Karttunen, <a href="/A280508/b280508.txt">Table of n, a(n) for n = 0..8191</a> %H A280508 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %H A280508 <a href="/index/Ge#GF2X">Index entries for sequences operating on polynomials in ring GF(2)[X]</a> %F A280508 a(n) = A003987(n,A057889(n)) = n XOR A057889(n). %F A280508 Other identities. For all n >= 0: %F A280508 a(A057889(n)) = a(n). %o A280508 (Scheme) (define (A280508 n) (A003987bi n (A057889 n))) ;; Where A003987bi implements A003987 (bitwise-XOR). %Y A280508 Cf. A003987, A057889, A280505, A280506, A280507, A280509. %Y A280508 Cf. A057890 (positions of zeros). %K A280508 nonn,base %O A280508 0,12 %A A280508 _Antti Karttunen_, Jan 09 2017