|
Search: id:A102279
|
|
|
| A102279 |
|
Numbers n such that n = phi(d_1)!*phi(d_2)!* ... *phi(d_k)! where d_1 d_2 ... d_k is the decimal expansion of n and assume that phi(0)=0. |
|
+0
2
|
|
| 1, 48, 720, 17280, 17915904000, 479219999055934390272000000000
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
All terms are of the form 2^i*3^j*5^t.
No more terms < 10^100. - David Wasserman (dwasserm(AT)earthlink.net), Apr 03 2008
|
|
EXAMPLE
|
17280 is in the sequence because 17280 = phi(1)!*phi(7)!*phi(2)!*phi(8)!*phi(0)!.
|
|
CROSSREFS
|
Cf. A097655, A102280, A102281.
Sequence in context: A008658 A136038 A138411 this_sequence A132464 A105948 A014401
Adjacent sequences: A102276 A102277 A102278 this_sequence A102280 A102281 A102282
|
|
KEYWORD
|
base,less,nonn
|
|
AUTHOR
|
Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Jan 08 2005
|
|
|
Search completed in 0.002 seconds
|
