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A086410 Smallest prime factor of 3-smooth numbers. 5
1, 2, 3, 2, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(n) = A020639(A003586(n));

a(n) <= A086411(n) <= 3.

a(A033845(n))=A086411(A033845(n))-1; a(A006899(n))=A086411(A006899(n)). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 25 2008]

CROSSREFS

Sequence in context: A111497 A097051 A078832 * A185049 A186181 A147561

Adjacent sequences:  A086407 A086408 A086409 * A086411 A086412 A086413

KEYWORD

nonn,nice

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 18 2003

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Last modified February 16 17:11 EST 2012. Contains 205938 sequences.