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A309761
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Numbers that are sums of consecutive powers of 10.
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4
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1, 10, 11, 100, 110, 111, 1000, 1100, 1110, 1111, 10000, 11000, 11100, 11110, 11111, 100000, 110000, 111000, 111100, 111110, 111111, 1000000, 1100000, 1110000, 1111000, 1111100, 1111110, 1111111, 10000000, 11000000, 11100000, 11110000, 11111000, 11111100
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OFFSET
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1,2
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COMMENTS
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Numbers of the form (10^i - 10^j)/9 with i > j.
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LINKS
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FORMULA
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a(i*(i-1)/2 + j) = (10^i - 10^(i-j))/9 for 1<=j<=i. - Robert Israel, Aug 16 2019
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EXAMPLE
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11100 = 10^2 + 10^3 + 10^4, so 11100 is in the sequence.
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MAPLE
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seq(seq((10^i-10^(i-j))/9, j=1..i), i=1..10); # Robert Israel, Aug 16 2019
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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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