A076369 - OEIS

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A076369

n + mu(n), where mu is the Moebius-function (A008683).

1

2, 1, 2, 4, 4, 7, 6, 8, 9, 11, 10, 12, 12, 15, 16, 16, 16, 18, 18, 20, 22, 23, 22, 24, 25, 27, 27, 28, 28, 29, 30, 32, 34, 35, 36, 36, 36, 39, 40, 40, 40, 41, 42, 44, 45, 47, 46, 48, 49, 50, 52, 52, 52, 54, 56, 56, 58, 59, 58, 60, 60, 63, 63, 64, 66, 65, 66, 68, 70, 69, 70, 72

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OFFSET

1,1

COMMENTS

a(n) = n iff n is not squarefree:

a(A013929(k))=A013929(k) and a(A005117(k))<>A005117(k).

LINKS

Table of n, a(n) for n=1..72.

FORMULA

a(n)=n+MoebiusMu[n]=A000027[n]+A008683[n].

CROSSREFS

Cf. A000027, A008683, A063015, A076840.

Sequence in context: A134005 A132320 A353400 * A328790 A319773 A256188

Adjacent sequences: A076366 A076367 A076368 * A076370 A076371 A076372

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller and Labos Elemer, Oct 14 2002

STATUS

approved