1,3

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

Dario Alejandro Alpern, Factorization using the Elliptic Curve Method.

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

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

Cf. A008351.

Sequence in context: A239481 A200114 A120652 * A011138 A022479 A021456

Adjacent sequences: A113822 A113823 A113824 * A113826 A113827 A113828

hard,nonn,base

Parthasarathy Nambi, Jan 23 2006

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

approved