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Search: id:A064617
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| 9, 98, 987, 9876, 98765, 987654, 9876543, 98765432, 987654321, 9876543210, 98765432099, 987654320988, 9876543209877, 98765432098766, 987654320987655, 9876543209876544, 98765432098765433, 987654320987654322
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n)/10^n converges to 80/81=0.987654320987654320...
9=1*8+1; 98=12*8+2; 987=123*8+3; 9876=1234*8+4; 98765=12345*8+5; 987654=123456*8+6; 9876543=1234567*8+7; 98765432=12345678*8+8; 987654321=123456789*9+9 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 17 2009]
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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) =10*a(n-1)+10-n =(19-n)*A002275(n)-A064616(n) =10*A002275(n)-A014824(n)
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PROGRAM
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(PARI) { a=0; for (n=1, 150, a=10*a + 10 - n; write("b064617.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: A085868 A147637 A057933 this_sequence A024115 A066557 A121706
Adjacent sequences: A064614 A064615 A064616 this_sequence A064618 A064619 A064620
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KEYWORD
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base,easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Sep 26 2001
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