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!)
 A076998 Difference between cubefree and squarefree components of n. 3
 0, 0, 0, 2, 0, 0, 0, 2, 6, 0, 0, 6, 0, 0, 0, 2, 0, 12, 0, 10, 0, 0, 0, 6, 20, 0, 6, 14, 0, 0, 0, 2, 0, 0, 0, 30, 0, 0, 0, 10, 0, 0, 0, 22, 30, 0, 0, 6, 42, 40, 0, 26, 0, 12, 0, 14, 0, 0, 0, 30, 0, 0, 42, 2, 0, 0, 0, 34, 0, 0, 0, 30, 0, 0, 60, 38, 0, 0, 0, 10, 6, 0, 0, 42, 0, 0, 0, 22, 0, 60, 0, 46 (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) = A007948(n) - A007947(n). - Antti Karttunen, Jul 21 2018 EXAMPLE a(4)=2 as cubefree(4)=4 and squarefree(4)=2. 4-2=2 PROG (PARI) rad(n)=local(p, i); p=factor(n)[, 1]; prod(i=1, length(p), p[i]) rad2(n)=local(p, pn, i); p=factor(n)[, 1]; pn=factor(n)[, 2]; prod(i=1, length(p), p[i]^min(2, pn[i])) for (k=1, 100, print1(rad2(k)-rad(k)", ")) CROSSREFS Cf. A007947, A007948. Sequence in context: A153587 A320437 A059286 * A173956 A306078 A284273 Adjacent sequences:  A076995 A076996 A076997 * A076999 A077000 A077001 KEYWORD nonn AUTHOR Jon Perry, Nov 28 2002 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 January 26 14:08 EST 2020. Contains 331280 sequences. (Running on oeis4.)