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.
Sequence in context: A239481 A200114 A120652 * A011138 A022479 A021456
Adjacent sequences: A113822 A113823 A113824 * A113826 A113827 A113828
Parthasarathy Nambi, Jan 23 2006
a(11)-a(13) from Robert G. Wilson v, Jan 27 2006