0,2
The number of distinct prime divisors of 89 is 1 (prime).
The number of distinct prime divisors of 889 is 2.
The number of distinct prime divisors of 8889 is 2.
Cf. A104543.
Sequence in context: A105069 A100825 A008767 this_sequence A140818 A139813 A129381
Adjacent sequences: A105252 A105253 A105254 this_sequence A105256 A105257 A105258
nonn
Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 29 2005
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