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Search: id:A062762
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| A062762 |
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Number of powerful numbers not exceeding 2^n. |
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+0
1
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| 1, 1, 2, 3, 5, 8, 11, 18, 26, 38, 55, 80, 116, 166, 240, 345, 497, 710, 1016
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OFFSET
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0,3
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FORMULA
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Number of terms x from A001694 for which x<= 2^n.
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EXAMPLE
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Below 128 {1,4,8,9,16,25,..,100,108,121,125,128} 18 powerful numbers can be found, so a(7)=18
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CROSSREFS
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Cf. A001694, A029837, A036380, A036386.
Sequence in context: A135908 A056891 A065462 this_sequence A004693 A119014 A006258
Adjacent sequences: A062759 A062760 A062761 this_sequence A062763 A062764 A062765
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jul 16 2001
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