A113825 Number of distinct prime factors of A008351(n).

0, 1, 2, 2, 1, 2, 3, 5, 4, 5, 5, 7, 2

Offset

1,3

Links

Table of n, a(n) for n=1..13.

Dario Alejandro Alpern, Factorization using the Elliptic Curve Method.

Example

The number of distinct prime factors of 212 is 2 which is the third term in the sequence.

Crossrefs

A008351: Concatenate a(n-1) and a(n-2) with a(1)=1 & a(2)=2.

Cf. A008351.

Sequence in context: A200114 A120652 A330608 * A011138 A022479 A327201

Adjacent sequences: A113822 A113823 A113824 * A113826 A113827 A113828

Keyword

hard,nonn,base

Author

Parthasarathy Nambi, Jan 23 2006

Extensions

a(11)-a(13) from Robert G. Wilson v, Jan 27 2006

Status

approved