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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105570 Nonsquarefree numbers in place: a(n) = n if n is not squarefree, 0 otherwise. 1
 0, 0, 0, 0, 4, 0, 0, 0, 8, 9, 0, 0, 12, 0, 0, 0, 16, 0, 18, 0, 20, 0, 0, 0, 24, 25, 0, 27, 28, 0, 0, 0, 32, 0, 0, 0, 36, 0, 0, 0, 40, 0, 0, 0, 44, 45, 0, 0, 48, 49, 50, 0, 52, 0, 54, 0, 56, 0, 0, 0, 60, 0, 0, 63, 64, 0, 0, 0, 68, 0, 0, 0, 72, 0, 0, 75, 76, 0, 0, 0, 80, 81, 0, 0, 84, 0, 0, 0, 88, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Antti Karttunen, Table of n, a(n) for n = 0..65537 FORMULA a(n) = n - abs(mu(n))*n. MATHEMATICA Table[If[SquareFreeQ[n], 0, n], {n, 0, 100}] (* Harvey P. Dale, Aug 13 2016 *) PROG (PARI) A105570(n) = if(issquarefree(n), 0, n); \\ Antti Karttunen, Jul 03 2018 CROSSREFS Cf. A005117, A008966, A305980. Sequence in context: A350998 A352729 A286875 * A327054 A101419 A060278 Adjacent sequences: A105567 A105568 A105569 * A105571 A105572 A105573 KEYWORD easy,nonn AUTHOR Paul Barry, Apr 14 2005 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 00:02 EST 2022. Contains 358431 sequences. (Running on oeis4.)