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A318325 a(n) = Sum_{d|n} [moebius(n/d) > 0]*(sigma(d)-d). 7
0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 17, 1, 10, 9, 15, 1, 22, 1, 23, 11, 14, 1, 39, 6, 16, 13, 29, 1, 45, 1, 31, 15, 20, 13, 61, 1, 22, 17, 53, 1, 57, 1, 41, 34, 26, 1, 83, 8, 44, 21, 47, 1, 70, 17, 67, 23, 32, 1, 125, 1, 34, 42, 63, 19, 81, 1, 59, 27, 77, 1, 139, 1, 40, 50, 65, 19, 93, 1, 113, 40, 44, 1, 159, 23, 46, 33, 95, 1, 163, 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) = Sum_{d|n} [A008683(n/d) == 1]*A001065(d).

a(n) = A051953(n) + A318326(n).

a(n) = A291784(n) - A318441(n).

PROG

(PARI) A318325(n) = sumdiv(n, d, (1==moebius(n/d))*(sigma(d)-d));

CROSSREFS

Cf. A001065, A051953, A291784, A318320, A318326, A318441.

Sequence in context: A173455 A324535 A318501 * A300244 A168111 A309491

Adjacent sequences:  A318322 A318323 A318324 * A318326 A318327 A318328

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 26 2018

STATUS

approved

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Last modified October 17 15:30 EDT 2019. Contains 328116 sequences. (Running on oeis4.)