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Search: id:A030163
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| A030163 |
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2*uphi(x)=x, where the unitary phi function (A047994) is defined by if x=p1^r1*p2^r2*p3^r3*... then uphi(x)=(p1^r1-1)(p2^r2-1)(p3^r3-1)... |
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2
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| 2, 12, 168, 240, 14880, 65280, 7608944640, 4294901760, 1125874137169920, 18446744069414584320
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