|
Search: id:A072157
|
|
|
| A072157 |
|
Denominator of Sum_{k=1..n} phi(k)/k^2. |
|
+0
2
|
|
| 1, 4, 36, 72, 1800, 1800, 88200, 176400, 529200, 105840, 12806640, 12806640, 2164322160, 2164322160, 10821610800, 21643221600, 6254891042400, 6254891042400, 2258015666306400, 451603133261280, 451603133261280, 451603133261280, 238898057495217120, 238898057495217120
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
EXAMPLE
|
1, 5/4, 53/36, 115/72, 3163/1800, 3263/1800, 170687/88200, ...
|
|
CROSSREFS
|
Cf. A072156.
Sequence in context: A091722 A053939 A167632 this_sequence A075215 A152760 A016826
Adjacent sequences: A072154 A072155 A072156 this_sequence A072158 A072159 A072160
|
|
KEYWORD
|
nonn,frac
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Jun 28 2002
|
|
|
Search completed in 0.002 seconds
|
