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Search: id:A126641
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| A126641 |
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a(n) is the number of 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, at least one of digits 6,7 and at least one of digits 8,9. |
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+0
2
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| 9, 73, 537, 3625, 22809, 135913, 777177, 4308265, 23329689, 124104553, 651267417, 3382100905, 17421964569, 89180975593, 454265623257, 2304999893545, 11660373751449, 58845428989033, 296407578308697, 1490778208598185
(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)=16*5^n-32*4^n+24*3^n-8*2^n+1
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EXAMPLE
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a(8)=4308265
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MAPLE
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f:=n->16*5^n-32*4^n+24*3^n-8*2^n+1;
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CROSSREFS
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Cf. A125630, A125948, A125947, A125946, A125945, A125940, A125909, A125908, A125880, A125897, A125904, A125858.
Sequence in context: A096129 A143571 A079927 this_sequence A081627 A164588 A023001
Adjacent sequences: A126638 A126639 A126640 this_sequence A126642 A126643 A126644
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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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