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A331700
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Binary XOR of squares of divisors of n.
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1
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1, 5, 8, 21, 24, 40, 48, 85, 89, 120, 120, 168, 168, 240, 240, 341, 288, 317, 360, 504, 384, 408, 528, 680, 617, 520, 640, 1008, 840, 816, 960, 1365, 1072, 1440, 1248, 1197, 1368, 1224, 1360, 2040, 1680, 1920, 1848, 1560, 1864, 2640, 2208, 2728, 2385, 3021
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Rémy Sigrist, Table of n, a(n) for n = 1..8192
Rémy Sigrist, Colored scatterplot of the first 2^18 terms (where the color is function of A007814(n))
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EXAMPLE
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For n = 6:
- the divisors of 6 are 1, 2, 3 and 6,
- so a(6) = 1 XOR 4 XOR 9 XOR 36 = 40.
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PROG
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(PARI) a(n) = my (s=0); fordiv (n, d, s=bitxor(s, d^2)); s
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CROSSREFS
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Cf. A001157, A007814, A178910, A295901.
Sequence in context: A268195 A169705 A138810 * A105634 A294124 A120036
Adjacent sequences: A331697 A331698 A331699 * A331701 A331702 A331703
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KEYWORD
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nonn,base
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AUTHOR
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Rémy Sigrist, Jan 25 2020
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STATUS
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approved
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