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A159836
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Integers n such that the orbit n, f(n), f(f(n)), ... is eventualy periodic with period 2, where f(n)=Product[a(k)^p(k)] when n has the prime factorization n=Product[p(k)^a(k)].
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8, 9, 18, 24, 25, 32, 36, 40, 45, 49, 50, 56, 63, 64, 75, 81, 88, 90, 96, 98, 99, 100, 104, 117, 120, 121, 125, 126, 128, 136, 144, 147, 150, 152, 153, 160, 162, 168, 169, 171, 175, 180, 184, 192, 196, 198, 200
(list; graph; refs; listen; history; internal format)
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