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OFFSET
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1,3
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COMMENTS
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The length (number of decimal digits) of a(n) may be a power of 2 and often simply doubles, when n is increased by 1. But there are many exceptions: n = 11, 12, 13 give lengths 2^8, 3*2^7, 2^9, respectively. A factor of 3 is found in the lengths of a(n) for n = 12, 112..123, 1113..1234, 11123..12345, and so on. A factor of 7 is found for n = 1112, 11112..11122, and so on. 15 is factor of the length of a(11111112).
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LINKS
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Alois P. Heinz, Table of n, a(n) for n = 1..12
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MAPLE
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R:= (S, m)-> iquo (S+m-1, m): A:= proc (m, n) option remember; `if`(n=1, 1, R (parse (cat (seq (A (m, j), j=1..n-1))), m)) end: a:= n-> A(n, n): seq(a(n), n=1..10);
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CROSSREFS
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Cf. A156146, A156147, A000040, A010783.
Sequence in context: A166168 A126559 A213795 * A164820 A022387 A108559
Adjacent sequences: A159859 A159860 A159861 * A159863 A159864 A159865
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KEYWORD
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easy,nonn
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AUTHOR
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Eric Angelini and Alois P. Heinz, Apr 24 2009
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STATUS
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approved
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