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A136030
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Smallest prime factor of composite Mersenne numbers.
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5
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23, 47, 233, 223, 13367, 431, 2351, 6361, 179951, 193707721, 228479, 439, 2687, 167, 11447, 7432339208719, 2550183799, 745988807, 3391
(list; graph; refs; listen; history; internal format)
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