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Search: id:A126627
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| A126627 |
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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 digits 1,2,3 and at least one of digits 4,5,6,7,8,9. |
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+0
2
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| 7, 49, 343, 2401, 16807, 116929, 803383, 5432161, 36120007, 236404609, 1525601623, 9726181921, 61371928807, 383929313089, 2384606035063, 14723095123681, 90457525939207, 553507860826369, 3375536272503703
(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)=6*6^n-15*5^n+20*4^n-15*3^n+6*2^n-1
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EXAMPLE
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a(8)=5432161
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MAPLE
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f:=n->6*6^n-15*5^n+20*4^n-15*3^n+6*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: A045584 A124536 A045578 this_sequence A000420 A050737 A033143
Adjacent sequences: A126624 A126625 A126626 this_sequence A126628 A126629 A126630
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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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