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A073539
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Numbers n such that if p is a prime and divides n then p divides phi(n) (but converse is not a condition for the sequence: phi(n) could have prime factors not dividing n).
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2
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1, 4, 8, 9, 16, 18, 25, 27, 32, 36, 49, 50, 54, 64, 72, 81, 98, 100, 108, 121, 125, 128, 144, 147, 162, 169, 196, 200, 216, 225, 242, 243, 250, 256, 288, 289, 294, 324, 338, 343, 361, 392, 400, 432, 441, 450, 484, 486, 500, 507, 512, 529, 576, 578, 588, 605
(list; graph; refs; listen; history; internal format)
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