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A079065 In prime factorization of n replace odd primes by 3. 0
1, 2, 3, 4, 3, 6, 3, 8, 9, 6, 3, 12, 3, 6, 9, 16, 3, 18, 3, 12, 9, 6, 3, 24, 9, 6, 27, 12, 3, 18, 3, 32, 9, 6, 9, 36, 3, 6, 9, 24, 3, 18, 3, 12, 27, 6, 3, 48, 9, 18, 9, 12, 3, 54, 9, 24, 9, 6, 3, 36, 3, 6, 27, 64, 9, 18, 3, 12, 9, 18, 3, 72, 3, 6, 27, 12, 9, 18, 3, 48, 81, 6, 3, 36, 9, 6, 9, 24, 3 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(n)<=n; a(n)=n iff n is 3-smooth (A003586); A065333(a(n))=1; a(a(n))=a(n); A001221(a(n))<=A001221(n); A001222(a(n))=A001222(n); A006519(a(n))=A006519(n).

FORMULA

Multiplicative with p -> if p>2 then 3 else 2, p prime.

CROSSREFS

Sequence in context: A086369 A092089 A117659 * A097272 A126630 A167234

Adjacent sequences:  A079062 A079063 A079064 * A079066 A079067 A079068

KEYWORD

nonn,mult

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 02 2003

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Last modified February 17 09:41 EST 2012. Contains 206009 sequences.