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A037286
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Replace 2n+1 by concatenation of its divisors.
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0
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1, 13, 15, 17, 139, 111, 113, 13515, 117, 119, 13721, 123, 1525, 13927, 129, 131, 131133, 15735, 137, 131339, 141, 143, 13591545, 147, 1749, 131751, 153, 151155, 131957, 159, 161, 13792163, 151365, 167, 132369, 171, 173, 135152575, 171177
(list; graph; refs; listen; history; internal format)
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