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A071008
Numbers n such that uphi(uphi(n))=n/2.
+0
1
2, 4, 16, 256, 65536, 3110400, 4294967296
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Maintained by
N. J. A. Sloane
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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