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 A378230 #7 Nov 26 2024 15:21:52
%S A378230 6,14,28,42,50,62,72,114,124,150,186,248,254,376,402,412,426,434,474,
%T A378230 496,498,508,762,784,786,796,868,938,978,994,1002,1016,1302,1528,1568,
%U A378230 1578,1626,1778,1834,1852,1888,1948,1988,2032,3056,3064,3094,3282,3350,3556,3568,3644,3682,3794,3858,3868,3882,3954,4064
%N A378230 Positions of 0's in A378226, where A278226 is XOR-Moebius transform of A318457, and A318457(n) = n XOR (sigma(n)-n).
%H A378230 Antti Karttunen, <a href="/A378230/b378230.txt">Table of n, a(n) for n = 1..9001</a>
%H A378230 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a>
%H A378230 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>
%o A378230 (PARI)
%o A378230 A318457(n) = bitxor(n,sigma(n)-n);
%o A378230 A378226(n) = { my(v=0); fordiv(n, d, if(issquarefree(n/d), v=bitxor(v, A318457(d)))); (v); }
%o A378230 isA378230(n) = (0==A378226(n));
%Y A378230 Positions of 0's in A378226.
%Y A378230 Cf. A001065, A318457.
%Y A378230 Subsequences: A000396 (at least the even terms).
%K A378230 nonn
%O A378230 1,1
%A A378230 _Antti Karttunen_, Nov 26 2024