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Search: id:A064616
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| A064616 |
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(10^n-1)*(91/81)-n*10^n/9. |
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+0
2
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| 9, 89, 789, 6789, 56789, 456789, 3456789, 23456789, 123456789, 123456789, -9876543211, -209876543211, -3209876543211, -43209876543211, -543209876543211, -6543209876543211, -76543209876543211, -876543209876543211, -9876543209876543211
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,150
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FORMULA
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a(n) =a(n-1)+(10-n)*10^(n-1) =(19-n)*A002275(n)-A064617(n) =10*A002275(n)-A014925(n)
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PROGRAM
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(PARI) { a=0; q=1; for (n=1, 150, a+=(10 - n)*q; q*=10; write("b064616.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 20 2009]
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CROSSREFS
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Sequence in context: A147884 A055410 A111918 this_sequence A133486 A015584 A072256
Adjacent sequences: A064613 A064614 A064615 this_sequence A064617 A064618 A064619
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KEYWORD
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base,easy,sign
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Sep 26 2001
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