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A075424 A075423(A075423(n)). 2
0, 1, 0, 1, 4, 5, 0, 1, 2, 9, 4, 5, 12, 13, 0, 1, 4, 5, 2, 9, 20, 21, 4, 1, 4, 1, 12, 13, 28, 29, 0, 1, 32, 33, 4, 5, 36, 37, 2, 9, 40, 41, 20, 13, 14, 45, 4, 5, 2, 9, 4, 25, 4, 5, 12, 13, 56, 57, 28, 29, 60, 9, 0, 1, 64, 65, 32, 33, 68, 69, 4, 5, 72, 13, 36, 37, 76, 77, 2, 1, 2, 81, 40, 41 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,5

COMMENTS

From Robert Israel, Apr 11 2019: (Start)

a(n) == n (mod 2).

a(n) = 0 iff n is in A000079.

a(n) = n-2 iff n-1 is in A007674. (End)

LINKS

Robert Israel, Table of n, a(n) for n = 2..10000

MAPLE

A075423:= n -> convert(numtheory:-factorset(n), `*`)-1:

map(A075423@@2, [$2..100]); # Robert Israel, Apr 11 2019

CROSSREFS

Cf. A000079, A007674, A075423, A075425.

Sequence in context: A254294 A143574 A262400 * A200619 A199621 A199390

Adjacent sequences:  A075421 A075422 A075423 * A075425 A075426 A075427

KEYWORD

nonn,look,changed

AUTHOR

Reinhard Zumkeller, Sep 15 2002

STATUS

approved

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Last modified April 21 20:03 EDT 2019. Contains 322328 sequences. (Running on oeis4.)