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 A115829 #10 Sep 29 2024 16:02:52 %S A115829 0,3,6,12,24,48,96,192,195,384,387,390,768,771,774,780,1536,1539,1542, %T A115829 1548,1560,2979,3072,3075,3078,3084,3096,3120,5958,6144,6147,6150, %U A115829 6156,6168,6192,6240,11916,11939,12288,12291,12294,12300,12312,12336,12384,12480 %N A115829 Integers i such that 10*i XOR 11*i = 21*i. %C A115829 XOR is A003987. %C A115829 Differs from A115805 for the first time at n = 21, where A115805(21) = 3072 while a(21) = 2979. %H A115829 <a href="/index/Con#CongruXOR">Index entries for sequences defined by congruent products under XOR</a> %t A115829 Select[Range[0, 20000], BitXor[10*#, 11*#] == 21*# &] (* _Paolo Xausa_, Sep 29 2024 *) %o A115829 (PARI) is(n)=bitxor(10*n, 11*n)==21*n \\ _Charles R Greathouse IV_, Sep 25 2024 %Y A115829 Cf. A003987, A115805, A115830 (shows this sequence in binary). %K A115829 nonn %O A115829 0,2 %A A115829 _Antti Karttunen_, Feb 01 2006