|
Search: id:A067383
|
|
|
| A067383 |
|
Numbers n such that sigma(phi(n))/sigma(n) = 3. |
|
+0
6
|
|
| 181, 899, 2501, 4687, 10991, 12989, 17653, 25199, 25853, 26549, 26657, 54473, 65941, 68381, 72007, 82777, 96197, 98903, 102719, 116449, 124013, 135907, 150121, 169153, 188917, 193553, 201173, 207461, 219559, 234301, 237961, 239279
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
MATHEMATICA
|
For[ n=1, True, n++, If[ DivisorSigma[ 1, EulerPhi[ n ] ]/DivisorSigma[ 1, n ]==3, Print[ n ] ] ]
|
|
CROSSREFS
|
Cf. A033631, A066831, A067382, A067384, A067385.
Sequence in context: A142552 A154628 A142731 this_sequence A107255 A163442 A137530
Adjacent sequences: A067380 A067381 A067382 this_sequence A067384 A067385 A067386
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Dean Hickerson (dean.hickerson(AT)yahoo.com), Jan 20 2002
|
|
|
Search completed in 0.002 seconds
|
