1,2

Table of n, a(n) for n=1..42.

Number of distinct prime divisors of 2 is 1 - which is the first term.

Number of distinct prime divisors of 24 is 2 - which is the second term.

Number of distinct prime divisors of 246 is 3 - which is the third term.

Cf. A019520.

Sequence in context: A007967 A054494 A112764 * A049805 A104887 A064886

Adjacent sequences: A108725 A108726 A108727 * A108729 A108730 A108731

nonn,base

Parthasarathy Nambi, Jun 21 2005

approved