0,2
The number of distinct prime divisors of 59 is 1 (prime).
The number of distinct prime divisors of 559 is 2.
The number of distinct prime divisors of 5559 is 3.
Cf. A104484, A104483.
Sequence in context: A072814 A145390 A128049 this_sequence A054988 A143393 A166497
Adjacent sequences: A104540 A104541 A104542 this_sequence A104544 A104545 A104546
nonn
Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 20 2005
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