A258570 Smallest prime factors of 5-full numbers.

1, 2, 2, 2, 3, 2, 2, 3, 2, 2, 3, 5, 2, 3, 2, 2, 2, 5, 2, 7, 3, 2, 2, 2, 2, 3, 2, 2, 2, 5, 2, 2, 7, 2, 2, 2, 11, 3, 2, 2, 2, 2, 2, 2, 13, 2, 5, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 3, 2, 7, 2, 2, 2, 2, 2, 2, 2, 17, 2, 3, 2, 2, 11, 2, 5, 2, 2, 2, 2, 2, 3, 19, 2, 2, 2

Offset

1,2

Comments

a(n) = A020639(A069492(n));

a(A258602(n)) = A000040(n) and a(m) != A000040(n) for m < A258602(n).

Links

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

Prog

(Haskell)
a258570 = a020639 . a069492

Crossrefs

Cf. A069492, A020639, A258602, A258567, A258568, A258569, A258571.

Sequence in context: A290839 A346651 A085694 * A257572 A343902 A160493

Adjacent sequences: A258567 A258568 A258569 * A258571 A258572 A258573

Keyword

nonn

Author

Reinhard Zumkeller, Jun 06 2015

Status

approved