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A067884
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Numbers n such that n=phi(sigma(phi(sigma(phi(sigma(n)))))).
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0
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1, 2, 8, 12, 16, 24, 30, 128, 240, 720, 1200, 1536, 1860, 6912, 15552, 15840, 18144, 32768, 67392, 83160, 92160, 142560, 272160, 290304, 290400, 712800, 1140480, 1190400, 3345408, 3571200, 5702400, 14859936, 29719872
(list; graph; refs; listen; history; internal format)
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