648, 1,296, 1,944, 2,592, 3,240, 3,888, and since 648 is infinite because all numbers keep going and never stop.
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162, 324, 486, 648, 810, 972, 1134, . . .
They are all the numbers in the set {41472*k, where k is an integer}.
72 144 216 288 360 432 504 576 648 720 792 864
72 144 216 288 360 432 504 576 648 720 792 864 72, 144, 216, 288, 360, 432, 504, 576, 648, 720 . . .
How about: 8*81 = 648 or 2*324 = 648 out of many possibilities