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A131664
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A string of n 1's repeated n times.
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1
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1, 11, 11, 111, 111, 111, 1111, 1111, 1111, 1111, 11111, 11111, 11111, 11111, 11111, 111111, 111111, 111111, 111111, 111111, 111111, 1111111, 1111111, 1111111, 1111111, 1111111, 1111111, 1111111, 11111111, 11111111, 11111111, 11111111
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listen;
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OFFSET
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1,2
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LINKS
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FORMULA
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G.f.: z/(1-z) * Sum_{n>=0} 10^n*z^(n*(n+1)/2).
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MAPLE
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PROG
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(Python)
from math import isqrt
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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