login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A318501 a(n) = SumXOR_{d|n} [moebius(n/d) > 0]*(sigma(d)-d). 3
0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 17, 1, 10, 9, 15, 1, 20, 1, 23, 11, 14, 1, 39, 6, 16, 13, 29, 1, 43, 1, 31, 15, 20, 13, 49, 1, 22, 17, 49, 1, 55, 1, 41, 32, 26, 1, 75, 8, 42, 21, 47, 1, 70, 17, 67, 23, 32, 1, 97, 1, 34, 40, 63, 19, 79, 1, 59, 27, 75, 1, 107, 1, 40, 48, 65, 19, 91, 1, 109, 40, 44, 1, 131, 23, 46, 33, 95, 1, 155, 21 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

a(n) = A318502(n) XOR A318503(n).

PROG

(PARI) A318501(n) = { my(v=0); fordiv(n, d, if(1==moebius(n/d), v=bitxor(v, sigma(d)-d))); (v); };

CROSSREFS

Cf. A003987, A008683, A318325, A318502, A318503.

Sequence in context: A001065 A173455 A324535 * A318325 A300244 A168111

Adjacent sequences:  A318498 A318499 A318500 * A318502 A318503 A318504

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 28 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 16 06:48 EDT 2019. Contains 327090 sequences. (Running on oeis4.)