The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A307653 a(n) = Sum_{d|n} mu(d) * d^d. 2
 1, -3, -26, -3, -3124, 46626, -823542, -3, -26, 9999996872, -285311670610, 46626, -302875106592252, 11112006824734470, 437893890380856224, -3, -827240261886336764176, 46626, -1978419655660313589123978, 9999996872, 5842587018385982521380300852 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..388 FORMULA a(prime(n)^m) = 1 - prime(n)^prime(n) = -A088730(n) for m > 0. G.f.: Sum_{k>=1} mu(k)*k^k*x^k/(1 - x^k). - Ilya Gutkovskiy, Apr 20 2019 EXAMPLE a(6) = 1 - 2^2 - 3^3 + 6^6 = 46626. MATHEMATICA Array[DivisorSum[#, MoebiusMu[#]*#^# &] &, 21] (* Michael De Vlieger, Apr 21 2019 *) PROG (PARI) {a(n) = sumdiv(n, d, moebius(d)*d^d)} CROSSREFS Cf. A000040, A008683, A023900, A088730, A307654, A321222. Sequence in context: A144788 A182135 A307654 * A326610 A221616 A321222 Adjacent sequences:  A307650 A307651 A307652 * A307654 A307655 A307656 KEYWORD sign AUTHOR Seiichi Manyama, Apr 20 2019 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.

Last modified June 5 12:47 EDT 2020. Contains 334840 sequences. (Running on oeis4.)