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 A115830 #5 Sep 29 2024 23:47:45 %S A115830 0,11,110,1100,11000,110000,1100000,11000000,11000011,110000000, %T A115830 110000011,110000110,1100000000,1100000011,1100000110,1100001100, %U A115830 11000000000,11000000011,11000000110,11000001100,11000011000,101110100011,110000000000,110000000011,110000000110 %N A115830 Sequence A115829 in binary. %C A115830 Differs from A115806 for the first time at n = 21, where A115806(21) = 110000000000 while a(21) = 101110100011. %F A115830 a(n) = A007088(A115829(n)). %t A115830 Map[FromDigits[IntegerDigits[#, 2]] &, Select[Range[0, 20000], BitXor[10*#, 11*#] == 21*# &]] (* _Paolo Xausa_, Sep 29 2024 *) %Y A115830 Cf. A007088, A115806, A115829. %K A115830 nonn,base %O A115830 0,2 %A A115830 _Antti Karttunen_, Feb 01 2006