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A066471 Numbers n such that sigma(EulerPhi(sigma(n))) = sigma(n). +0
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1, 2, 8, 12, 128, 240, 350, 366, 368, 575, 671, 720, 743, 1098, 2417, 6912, 18967, 19399, 32768, 142560, 173340, 179010, 184032, 188892, 203310, 209628, 225342, 228582, 232160, 244782, 255460, 271072, 274422, 279045, 282285, 287810, 304910 (list; graph; listen)
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.


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