|
Search: id:A064607
|
|
|
| A064607 |
|
Partial sum of Sigma_4(n) is divisible by n, where Sigma_4(n)=A001159(n). |
|
+0
7
|
|
| 1, 2, 7, 151, 257, 1823, 3048, 5588, 6875, 7201, 8973, 24099
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Analogous sequences for various arithmetical functions are A050226, A056650, A064605-A064607, A064610, A064611, A048290, A062982, A045345.
|
|
FORMULA
|
Mod[Sum{sigma_4(j), j=1..n}, n]=Mod[A064604(n), n]=0
|
|
EXAMPLE
|
Adding 4th-power divisor-sums for j=1,...,7 gives 1+17+82+273+626+1394+2402=4795 which is divisible by n=7, so 7 is here and the integer quotient is 655.
|
|
CROSSREFS
|
A001159, A064604 A050226, A056650, A064605-A064607, A064610-A064612, A048290, A062982, A045345.
Sequence in context: A120379 A101799 A062617 this_sequence A005345 A077746 A159034
Adjacent sequences: A064604 A064605 A064606 this_sequence A064608 A064609 A064610
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Sep 24 2001
|
|
|
Search completed in 0.002 seconds
|
