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A117360 Numbers m such that m and 2*m+1 have the same number of prime factors. +0
2
2, 3, 4, 5, 10, 11, 23, 25, 29, 34, 38, 40, 41, 46, 52, 53, 55, 57, 76, 77, 83, 89, 91, 93, 106, 113, 118, 123, 129, 130, 131, 133, 143, 145, 159, 161, 169, 171, 172, 173, 177, 179, 185, 191, 201, 203, 205, 206, 212, 213, 218, 220, 226, 233, 235, 238, 239, 251 (list; graph; listen)
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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