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A105971 Number of distinct prime divisors of 66...667 (with n 6's). 0
1, 1, 2, 2, 2, 1, 2, 1, 1, 3, 1, 3, 3, 4, 3, 3, 3, 2, 4, 1, 2, 2, 1, 2, 5, 2, 4, 4, 3, 4, 3, 3, 3, 3, 4, 3, 4, 3, 4, 2, 1, 3, 5, 4, 4, 6, 6, 5, 4, 2, 4, 4, 4, 6, 5, 4, 4, 3, 3, 5, 5, 3, 1, 4, 5, 1, 5, 5, 5, 4, 3, 2, 4, 4, 4, 4, 5, 4, 5, 6, 2, 7, 6, 4, 7, 5, 5, 4, 5, 2, 5, 4, 3, 6, 4, 6, 6, 4, 3, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..99.

EXAMPLE

The number of distinct prime divisors of 67 is 1 (prime).

The number of distinct prime divisors of 667 is 2.

The number of distinct prime divisors of 6667 is 2.

CROSSREFS

Cf. A104889, A104524.

Sequence in context: A168141 A232654 A034095 * A280314 A080354 A238529

Adjacent sequences:  A105968 A105969 A105970 * A105972 A105973 A105974

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Apr 28 2005

STATUS

approved

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Last modified January 22 19:39 EST 2020. Contains 331153 sequences. (Running on oeis4.)