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 A115823 #17 Aug 30 2025 02:53:16 %S A115823 0,3,5,6,10,12,20,21,24,40,41,42,48,79,80,82,84,85,96,158,160,163,164, %T A115823 168,169,170,192,195,316,320,323,325,326,328,329,335,336,338,340,341, %U A115823 384,387,389,390,632,633,640,643,645,646,650,652,656,658,670,672,675 %N A115823 Integers i such that 8*i XOR 13*i = 21*i. %H A115823 <a href="/index/Con#CongruXOR">Index entries for sequences defined by congruent products under XOR</a> %t A115823 Select[Range[0,700],BitXor[8#,13#]==21#&] (* _Harvey P. Dale_, May 02 2012 *) %o A115823 (PARI) is(n)=bitxor(8*n, 13*n)==21*n \\ _Charles R Greathouse IV_, Sep 25 2024 %Y A115823 XOR is A003987. %Y A115823 Seems to be a superset of A115805. A115825 gives the terms not present in A115805. A115824 shows this sequence in binary. %K A115823 nonn,changed %O A115823 0,2 %A A115823 _Antti Karttunen_, Feb 01 2006 %E A115823 Definition corrected by _Harvey P. Dale_, May 02 2012