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A078252
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Smallest n-digit multiple of n in which the even-numbered digits are all equal and the odd-numbered digits are all equal, or 0 if no such number exists.
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1
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1, 10, 111, 1212, 50505, 101010, 7070707, 16161616, 111111111, 1010101010, 29292929292, 121212121212, 0, 14141414141414, 525252525252525, 1616161616161616, 0, 101010101010101010, 0, 20202020202020202020
(list; graph; refs; listen; history; internal format)
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