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Search: id:A126632
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| A126632 |
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a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of digits 2,3, at least one of digits 4,5,6 and at least one of digits 7,8,9. |
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+0
2
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| 9, 79, 669, 5431, 42189, 314119, 2251629, 15625591, 105563469, 697683559, 4529641389, 28986744151, 183339095949, 1148652643399, 7141191155949, 44118519949111, 271168742599629, 1659705919705639, 10123331198091309
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
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FORMULA
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a(n)=18*6^n-45*5^n+48*4^n-27*3^n+8*2^n-1
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EXAMPLE
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a(8)=15625591
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MAPLE
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f:=n->18*6^n-45*5^n+48*4^n-27*3^n+8*2^n-1;
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CROSSREFS
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Cf. A125630, A125948, A125947, A125946, A125945, A125910, A125909, A125908, A125880, A125897, A125904, A125858.
Sequence in context: A046196 A123918 A044577 this_sequence A125909 A125421 A163445
Adjacent sequences: A126629 A126630 A126631 this_sequence A126633 A126634 A126635
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KEYWORD
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nonn
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AUTHOR
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Aleksandar M. Janjic and Milan R. Janjic (agnus(AT)blic.net), Feb 08 2007
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