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Search: id:A101699
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| A101699 |
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Numbers n such that phi(n) = d_1*d_1!+d_2*d_2!+...+d_k*d_k! where d_1 d_2 ... d_k is the decimal expansion of n. |
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+0
2
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OFFSET
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1,2
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EXAMPLE
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13179592 is in the sequence because phi(13179592) = 1*1!+3*3!+1*1!+7*7!+9*9!+5*5!+9*9!+2*2!.
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MATHEMATICA
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Do[If[Eulerphi[n] == Apply[Plus, IntegerDigits[n]*IntegerDigits[n]! ], Print[n]], {n, 30000000}]
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CROSSREFS
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Cf. A101697, A101698.
Sequence in context: A013728 A028693 A033998 this_sequence A122148 A068736 A138763
Adjacent sequences: A101696 A101697 A101698 this_sequence A101700 A101701 A101702
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KEYWORD
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base,fini,nonn
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AUTHOR
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Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Dec 19 2004
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