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A075424 a(n) = A075423(A075423(n)). 3
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
MAPLE
A075423:= n -> convert(numtheory:-factorset(n), `*`)-1:
map(A075423@@2, [$2..100]); # Robert Israel, Apr 11 2019
CROSSREFS
Sequence in context: A254294 A143574 A262400 * A200619 A199621 A199390
KEYWORD
nonn,look
AUTHOR
Reinhard Zumkeller, Sep 15 2002
STATUS
approved

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Last modified May 19 00:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)