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A169811 a(n) = n XOR n*(n+1)/2. 3
0, 0, 1, 5, 14, 10, 19, 27, 44, 36, 61, 73, 66, 86, 103, 119, 152, 136, 185, 173, 198, 242, 235, 259, 308, 348, 325, 353, 394, 430, 463, 495, 560, 528, 625, 597, 702, 666, 707, 811, 796, 884, 941, 921, 1010, 1062, 1047, 1095, 1192, 1272, 1225, 1309, 1366, 1442, 1531 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..54.

MATHEMATICA

Table[BitXor[n (n + 1)/2, n], {n, 0, 100}] (* Vladimir Joseph Stephan Orlovsky, Jul 17 2011 *)

CROSSREFS

Cf. A070883, A169810.

Sequence in context: A292249 A205134 A196363 * A272970 A168213 A175485

Adjacent sequences:  A169808 A169809 A169810 * A169812 A169813 A169814

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 28 2010

STATUS

approved

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Last modified April 20 06:36 EDT 2019. Contains 322294 sequences. (Running on oeis4.)