|
Search: id:A066232
|
|
|
| A066232 |
|
Numbers n such that EulerPhi(n) = EulerPhi(n-2)-EulerPhi(n-1). |
|
+0
2
|
|
| 195, 3531, 9339, 27231, 46795, 78183, 90195, 112995, 135015, 437185, 849405, 935221
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
As in A065557, all terms listed here are odd and square-free. Problem: Prove that this holds in general.
|
|
EXAMPLE
|
EulerPhi(195) = 96 = 192-96 = EulerPhi(193)-EulerPhi(194).
|
|
MATHEMATICA
|
Select[Range[3, 10^6], EulerPhi[ # ] == EulerPhi[ # - 2] - EulerPhi[ # - 1] &]
|
|
CROSSREFS
|
Adjacent sequences: A066229 A066230 A066231 this_sequence A066233 A066234 A066235
Sequence in context: A080394 A055970 A080913 this_sequence A084232 A077594 A044870
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 18 2001
|
|
|
Search completed in 0.002 seconds
|
