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Search: id:A105259
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| A105259 |
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Number of distinct prime divisors of 99..91 (with n 9s). |
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+0
2
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| 0, 2, 1, 2, 1, 3, 1, 4, 2, 3, 3, 3, 3, 4, 3, 4
(list; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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If n=1, then the number of distinct prime divisors of 91 is 2.
If n=2, then the number of distinct prime divisors of 991 is 1 (a prime).
If n=3, then the number of distinct prime divisors of 9991 is 2.
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CROSSREFS
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Cf. A093177.
Sequence in context: A029349 A112197 A112198 this_sequence A029229 A029216 A138222
Adjacent sequences: A105256 A105257 A105258 this_sequence A105260 A105261 A105262
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 14 2005
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