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Search: id:A138720
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| A138720 |
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Concatenation of k digits 1, k digits 0 and k digits 1, where k is the n-th positive triangular number. |
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5
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| 101, 111000111, 111111000000111111, 111111111100000000001111111111, 111111111111111000000000000000111111111111111, 111111111111111111111000000000000000000000111111111111111111111
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