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 A169813 a(n) = n XOR sigma(n), where sigma(n) is the number of divisors of n, A000203. 6
 0, 1, 7, 3, 3, 10, 15, 7, 4, 24, 7, 16, 3, 22, 23, 15, 3, 53, 7, 62, 53, 50, 15, 36, 6, 48, 51, 36, 3, 86, 63, 31, 17, 20, 19, 127, 3, 26, 31, 114, 3, 74, 7, 120, 99, 102, 31, 76, 8, 111, 123, 86, 3, 78, 127, 64, 105, 96, 7, 148, 3, 94, 87, 63, 21, 210, 7, 58, 37, 214, 15, 139, 3, 56 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Antti Karttunen, Table of n, a(n) for n = 1..16384 PROG (Scheme) (define (A169813 n) (A003987bi n (A000203 n))) ;; Where A003987bi implements the bitwise-XOR, A003987 and code for A000203 can be found under that entry. - Antti Karttunen, Nov 25 2017 (PARI) a(n) = bitxor(n, sigma(n)); \\ Michel Marcus, Nov 25 2017 CROSSREFS Cf. A000203, A003987, A070883, A169810, A169811, A169812, A169814. Cf. also A106409, A178910, A227320, A294899. Sequence in context: A225453 A153858 A200294 * A097517 A127559 A066747 Adjacent sequences:  A169810 A169811 A169812 * A169814 A169815 A169816 KEYWORD nonn,look AUTHOR N. J. A. Sloane, May 28 2010 STATUS approved

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Last modified January 23 15:15 EST 2021. Contains 340385 sequences. (Running on oeis4.)