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 A324639 Numbers k such that bitand(2k,sigma(k)) = 2*bitand(k,sigma(k)-k), where bitand is bitwise-AND, A004198. 3
 1, 2, 4, 5, 6, 8, 9, 10, 16, 17, 20, 26, 28, 32, 36, 37, 38, 41, 44, 50, 64, 73, 74, 88, 98, 100, 104, 128, 130, 134, 136, 137, 149, 152, 153, 164, 172, 184, 256, 257, 261, 262, 264, 272, 277, 284, 293, 294, 304, 328, 337, 368, 392, 405, 410, 424, 442, 464, 496, 512, 520, 521, 522, 528, 529, 538, 548, 549, 550, 556, 560, 577 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers k for which 2*A318458(k) = A318468(k). LINKS Antti Karttunen, Table of n, a(n) for n = 1..20000 PROG (PARI) for(n=1, oo, if( (2*(bitand(n, sigma(n)-n))==bitand(n+n, sigma(n))), print1(n, ", "))); CROSSREFS Cf. A004198, A318458, A318468. Subsequences: A324643, A324718 (odd terms). Sequence in context: A035063 A004128 A023717 * A171599 A328594 A346129 Adjacent sequences: A324636 A324637 A324638 * A324640 A324641 A324642 KEYWORD nonn AUTHOR Antti Karttunen, Mar 14 2019 STATUS approved

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Last modified March 24 09:43 EDT 2023. Contains 361470 sequences. (Running on oeis4.)