A169813 a(n) = n XOR sigma(n), where sigma(n) is the number of divisors of n, A000203.

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

Offset

1,3

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Index entries for sequences related to binary expansion of n

Index entries for sequences related to sigma(n)

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