A092523 Number of distinct prime factors of n-th odd number.

0, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 3, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 3, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 3, 1, 1, 2, 2

Offset

1,8

Comments

a(n) = A001221(2*n-1).

Links

Ray Chandler, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Odd Number

Eric Weisstein's World of Mathematics, Distinct Prime Factors

Mathematica

Table[PrimeNu[n], {n, 1, 211, 2}] (* Harvey P. Dale, May 25 2015 *)

Crossrefs

Cf. A091304.

Sequence in context: A349671 A120889 A322351 * A120891 A034002 A276630

Adjacent sequences: A092520 A092521 A092522 * A092524 A092525 A092526

Keyword

nonn

Author

Reinhard Zumkeller, Apr 07 2004

Status

approved