A258571 Smallest prime factors of 6-full numbers.

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

Offset

1,2

Comments

a(n) = A020639(A069493(n));

a(A258603(n)) = A000040(n) and a(m) != A000040(n) for m < A258603(n).

Links

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

Prog

(Haskell)
a258571 = a020639 . a069493

Crossrefs

Cf. A069493, A020639, A258603, A258567, A258568, A258569, A258570.

Sequence in context: A268317 A234092 A047931 * A033618 A061357 A270966

Adjacent sequences: A258568 A258569 A258570 * A258572 A258573 A258574

Keyword

nonn

Author

Reinhard Zumkeller, Jun 06 2015

Status

approved