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A086286 Smallest prime factor of 7-smooth numbers. 1
1, 2, 3, 2, 5, 2, 7, 2, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 5, 3, 2, 2, 2, 5, 2, 2, 2, 3, 2, 7, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 5, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 5, 2, 3, 2, 2, 2, 2, 2, 2, 3, 2, 3, 5, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 7, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A020639(A002473(n));

a(n) <= A086287(n) <= 7.

LINKS

Table of n, a(n) for n=1..100.

CROSSREFS

Sequence in context: A072591 A085308 A209190 * A272565 A135679 A092028

Adjacent sequences:  A086283 A086284 A086285 * A086287 A086288 A086289

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 15 2003

STATUS

approved

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Last modified October 22 21:09 EDT 2018. Contains 316505 sequences. (Running on oeis4.)