This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A243289 n minus the index of the greatest prime dividing n-th squarefree number: a(n) = n - A243290(n). 6
 1, 1, 1, 1, 3, 2, 4, 3, 3, 6, 8, 5, 5, 10, 10, 7, 11, 8, 16, 9, 16, 15, 19, 12, 17, 20, 14, 24, 15, 21, 16, 25, 17, 29, 27, 26, 20, 20, 28, 34, 36, 23, 34, 40, 25, 25, 35, 43, 43, 28, 38, 29, 46, 40, 45, 32, 51, 47, 44, 52, 36, 36, 56, 37, 61, 50, 39, 39, 64, 58 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS If A005117(n) <= 2n, or equally, if A243351 is always positive, then this sequence is certainly positive as well. LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 FORMULA a(n) = n - A243290(n). CROSSREFS Cf. A005117, A006530, A049084, A243290, A243291, A243348, A243349, A243351. Sequence in context: A025509 A130079 A247190 * A134559 A007456 A316141 Adjacent sequences:  A243286 A243287 A243288 * A243290 A243291 A243292 KEYWORD nonn AUTHOR Antti Karttunen, Jun 03 2014 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 December 12 18:24 EST 2018. Contains 318081 sequences. (Running on oeis4.)