Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
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