The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A062004 a(n) = 2*n*mu(n). 2
 2, -4, -6, 0, -10, 12, -14, 0, 0, 20, -22, 0, -26, 28, 30, 0, -34, 0, -38, 0, 42, 44, -46, 0, 0, 52, 0, 0, -58, -60, -62, 0, 66, 68, 70, 0, -74, 76, 78, 0, -82, -84, -86, 0, 0, 92, -94, 0, 0, 0, 102, 0, -106, 0, 110, 0, 114, 116, -118, 0, -122, 124, 0, 0, 130, -132, -134, 0, 138, -140, -142, 0, -146, 148, 0, 0, 154, -156, -158, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n)/2 is multiplicative because both mu(n) and n are. - Mitch Harris, Jun 09 2005 b(n) = a(n)/a(1) is multiplicative with b(p^1) = -p, b(p^e) = 0 if e > 1. - David W. Wilson, Jun 12 2005 LINKS Harry J. Smith, Table of n, a(n) for n = 1..1000 FORMULA a(n) = 2*A055615(n). - Michel Marcus, May 03 2022 MATHEMATICA Table[MoebiusMu[n]2n, {n, 100}] (* Harvey P. Dale, May 11 2011 *) PROG (Magma) [2*n*MoebiusMu(n) : n in [1..100]]; // G. C. Greubel, May 03 2022 (SageMath) [2*n*moebius(n) for n in (1..100)] # G. C. Greubel, May 03 2022 CROSSREFS Cf. A008683, A055615. Sequence in context: A004518 A013670 A121206 * A300268 A009285 A013082 Adjacent sequences: A062001 A062002 A062003 * A062005 A062006 A062007 KEYWORD easy,sign AUTHOR Jason Earls, Jul 04 2001 STATUS approved

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

Last modified November 30 23:40 EST 2023. Contains 367464 sequences. (Running on oeis4.)