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Search: id:A091956
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| A091956 |
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Number of increasing subsequences that can be made from the sequence of successive primes. |
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+0
2
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OFFSET
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1,2
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COMMENT
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See A091955 for the precise definition of increasing subsequence.
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EXAMPLE
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For n = 4 we take 2357 and find that the increasing subsequence are
2,3,5,7
2,3,57
2,357
23,57
2357
so a(4)=5
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CROSSREFS
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Cf. A091955.
Sequence in context: A108296 A072100 A104882 this_sequence A107480 A128021 A036241
Adjacent sequences: A091953 A091954 A091955 this_sequence A091957 A091958 A091959
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KEYWORD
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more,nonn,base
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AUTHOR
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Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 12 2004
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