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A102622
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Nonprime numbers n concatenated n times.
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1
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1, 4444, 666666, 88888888, 999999999, 10101010101010101010, 121212121212121212121212, 1414141414141414141414141414, 151515151515151515151515151515, 16161616161616161616161616161616
(list; graph; refs; listen; history; internal format)
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