0,4

Amiram Eldar, Table of n, a(n) for n = 0..201

a(n) = A001221(A173811(n+1)). - Michel Marcus, Jan 27 2014

The number of distinct prime divisors of 83 is 1 (prime).

The number of distinct prime divisors of 883 is 1 (prime).

The number of distinct prime divisors of 8883 is 3.

Table[PrimeNu[FromDigits[PadLeft[{3}, n, 8]]], {n, 100}] (* Harvey P. Dale, Mar 08 2015 *)

a(n) = omega((8*10^(n+1)-53)/9); \\ Michel Marcus, Jan 27 2014

Cf. A104660, A104518, A104660.

Sequence in context: A236452 A056529 A087282 * A088429 A134658 A296518

Adjacent sequences: A105970 A105971 A105972 * A105974 A105975 A105976

nonn,base

Parthasarathy Nambi, Apr 28 2005

approved