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Search: id:A132133
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| A132133 |
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Number of n-digit "Punctual Birds" (cf. 131881). |
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+0
5
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OFFSET
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1,1
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COMMENT
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The number of n-digit "Early Birds" is 9*10^(n-1) - A132133(n), which is 0, 45, 630, 6896, 73059, 757755, 7773854, ... for n=1,2,...
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EXAMPLE
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a(2)=45 because there are 45 2-digit Punctual Birds (10-11, 13-20, 22, 24-30, 33, 35-40, 44, 46-50, 55, 57-60, 66, 68-70, 77, 79-80, 88, and 90)
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CROSSREFS
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Cf. A033307, A117804, A116700, A131881, A132131, A132132.
Adjacent sequences: A132130 A132131 A132132 this_sequence A132134 A132135 A132136
Sequence in context: A024209 A026092 A054628 this_sequence A009410 A030113 A001556
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KEYWORD
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base,nonn
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AUTHOR
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Graeme McRae (g_m(AT)mcraefamily.com), Aug 11 2007
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