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Search: id:A090207
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| A090207 |
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Number of factors of n-th nonprime Fibonacci number. |
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+0
1
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| 1, 1, 1, 3, 2, 2, 2, 6, 2, 3, 3, 5, 2, 4, 3, 2, 9, 3, 2, 4, 4, 7, 2, 4, 3, 2, 3, 10, 3, 3
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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F(0) = 0; F(1) = 1; F(n) = F(n-1) + F(n-2); F(0:9) = 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 The nonprime numbers are: 0, 1, 1, 8, 21, 34 which have number of factors: 1, 1, 1, 3, 2, 2
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CROSSREFS
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Cf. A090206, A000045.
Adjacent sequences: A090204 A090205 A090206 this_sequence A090208 A090209 A090210
Sequence in context: A064126 A130845 A134653 this_sequence A065437 A097721 A073756
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KEYWORD
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easy,nonn
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AUTHOR
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Felix Tubiana (fat2(AT)columbia.edu), Jan 22 2004
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