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A039743 GCD(phi(a(n)),a(n)-1) = number of prime factors of a(n). +0
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2, 4, 8, 15, 16, 32, 35, 39, 51, 55, 63, 64, 70, 75, 87, 95, 99, 111, 115, 119, 123, 128, 130, 135, 143, 147, 154, 155, 159, 171, 183, 187, 203, 207, 215, 219, 235, 238, 256, 267, 275, 279, 280, 287, 291, 295, 299, 303, 310, 319, 322, 323, 327, 335, 339, 351 (list; graph; listen)
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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