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Search: id:A081249
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| 0, 1, 1, 2, 4, 7, 9, 10, 10, 11, 13, 16, 20, 25, 31, 38, 46, 55, 63, 70, 76, 81, 85, 88, 90, 91, 91, 92, 94, 97, 101, 106, 112, 119, 127, 136, 146, 157, 169, 182, 196, 211, 227, 244, 262, 281, 301, 322, 344, 367, 391, 416, 442, 469, 495, 520, 544, 567, 589, 610, 630
(list; graph; listen)
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OFFSET
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1,4
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LINKS
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Klaus Brockhaus, Illustration for A081134, A081249, A081250 and A081251
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FORMULA
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a(n) = sum{j=1..n, A081134(j)}.
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EXAMPLE
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First seven terms of A081134 are 0,1,0,1,2,3,2, so a(7) = 9.
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PROGRAM
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(PARI) {s=0; for(n=1, 62, p=3^floor(0.1^25+log(n)/log(3)); print1(s=s+min(n-p, 3*p-n), ", "))}
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CROSSREFS
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Sequence in context: A012985 A094446 A071790 this_sequence A047541 A120749 A138830
Adjacent sequences: A081246 A081247 A081248 this_sequence A081250 A081251 A081252
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KEYWORD
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easy,nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 17 2003
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