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A076333 Squarefree kernels of nonsquarefree numbers. 3
2, 2, 3, 6, 2, 6, 10, 6, 5, 3, 14, 2, 6, 10, 22, 15, 6, 7, 10, 26, 6, 14, 30, 21, 2, 34, 6, 15, 38, 10, 3, 42, 22, 30, 46, 6, 14, 33, 10, 26, 6, 14, 58, 39, 30, 11, 62, 5, 42, 2, 66, 15, 34, 70, 6, 21, 74, 30, 38, 51, 78, 10, 6, 82, 42, 13, 57, 86, 35, 22, 30, 46, 94, 21, 6, 14, 66 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A007947(A013929(n)).
Sum_{k=1..n} a(k) ~ c * n^2 / 2, where c = (A065463 - 6/Pi^2)/(1 - 6/Pi^2)^2 = 0.627858264532... . - Amiram Eldar, Dec 09 2023
MATHEMATICA
f[n_] := If[(r = Times @@ FactorInteger[n][[;; , 1]]) < n, r , 0]; Select[f /@ Range[200], # > 0 &] (* Amiram Eldar, Sep 07 2020 *)
CROSSREFS
Sequence in context: A207621 A209157 A284785 * A015051 A362199 A260389
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 06 2002
STATUS
approved

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Last modified March 19 09:40 EDT 2024. Contains 370981 sequences. (Running on oeis4.)