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Search: id:A058627
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| A058627 |
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Numbers n such that phi(n) = product of the digits of n. |
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+0
3
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| 1, 24, 26, 87, 168, 388, 594, 666, 1998, 2688, 5698, 5978, 6786, 7888, 68796
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Oxford University Press, NY 2000, Chapter 72, 'Apocalyptic Numbers,' Pages 176 - 178.
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LINKS
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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EXAMPLE
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Phi(666) = 6*6*6
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MATHEMATICA
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Select[ Range[ 10^7], EulerPhi[ # ] == Times @@ IntegerDigits[ # ] &]
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CROSSREFS
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Sequence in context: A079720 A053680 A053968 this_sequence A116203 A071833 A064159
Adjacent sequences: A058624 A058625 A058626 this_sequence A058628 A058629 A058630
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KEYWORD
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nonn,base
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 26 2000
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