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A258568 Smallest prime factors of 3-full numbers. 6
1, 2, 2, 3, 2, 2, 3, 5, 2, 2, 3, 2, 7, 2, 2, 5, 2, 3, 2, 2, 2, 2, 11, 2, 2, 2, 2, 3, 13, 7, 2, 2, 5, 3, 2, 2, 2, 2, 17, 2, 2, 2, 2, 3, 19, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 23, 2, 11, 2, 5, 2, 2, 7, 3, 2, 2, 2, 3, 2, 2, 2, 2, 2, 29, 2, 2, 3, 13, 31, 3, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A020639(A036966(n));

a(A258600(n)) = A000040(n) and a(m) != A000040(n) for m < A258600(n).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG

(Haskell)

a258568 = a020639 . a036966

CROSSREFS

Cf. A036966, A020639, A258600, A258567, A258569, A258570, A258571.

Sequence in context: A254618 A268672 A054483 * A108939 A138143 A285727

Adjacent sequences:  A258565 A258566 A258567 * A258569 A258570 A258571

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jun 06 2015

STATUS

approved

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Last modified May 19 20:41 EDT 2019. Contains 323410 sequences. (Running on oeis4.)