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Search: id:A153428
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| A153428 |
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Numbers n such that phi(n)=p^3, where p is product of digits of n. |
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+0
2
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OFFSET
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1,2
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COMMENT
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There is no further term up to 3*10^8.
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EXAMPLE
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phi(113216152)=(1*1*3*2*1*6*1*5*2)^3, so 113216152 is in the sequence.
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MATHEMATICA
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Do[If[Apply[Times, IntegerDigits[n]]^3==EulerPhi[n], Print[n]], {n, 300000000}]
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CROSSREFS
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Cf. A153426, A153427.
Sequence in context: A144649 A166371 A076165 this_sequence A032736 A032738 A133858
Adjacent sequences: A153425 A153426 A153427 this_sequence A153429 A153430 A153431
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KEYWORD
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base,more,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Jan 02 2009
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