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A035239
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Smallest number that contains the numbers from 1 to n as substrings.
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3
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1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 1023456789, 11023456789, 101123456789, 1011213456789, 10112131456789, 101121314156789, 1011213141516789, 10112131415161789, 101121314151617189
(list; graph; refs; listen; history; internal format)
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