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A076289
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Numbers of the form (10^(m*r)-1)/(10^r-1) for positive integers m, r.
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9
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1, 11, 101, 111, 1001, 1111, 10001, 10101, 11111, 100001, 111111, 1000001, 1001001, 1010101, 1111111, 10000001, 11111111, 100000001, 100010001, 101010101, 111111111, 1000000001, 1001001001, 1111111111, 10000000001, 10000100001, 10101010101, 11111111111
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OFFSET
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1,2
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LINKS
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MAPLE
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N::= 20: # for terms <= 10^N
R:= {1}:
for n from 1 to 2*N do
R:= R union select(`<=`, {seq((10^n-1)/(10^d-1), d = numtheory:-divisors(n))}, 10^N);
od:
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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