login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A101699 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. 1
1, 23, 66666, 13179592 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

EXAMPLE

13179592 is in the sequence because phi(13179592) = 1*1!+3*3!+1*1!+7*7!+9*9!+5*5!+9*9!+2*2!.

MATHEMATICA

Do[If[Eulerphi[n] == Apply[Plus, IntegerDigits[n]*IntegerDigits[n]! ], Print[n]], {n, 30000000}]

CROSSREFS

Cf. A101697, A101698.

Sequence in context: A157167 A173369 A185695 * A122148 A068736 A138763

Adjacent sequences:  A101696 A101697 A101698 * A101700 A101701 A101702

KEYWORD

base,fini,nonn

AUTHOR

Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 19 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 18:02 EST 2012. Contains 205660 sequences.