|
Search: id:A126602
|
|
|
| A126602 |
|
a(1)=2^3*5*7*29=8120; for n>1, a(n) = (-1)sigma(a(n-1)). |
|
+0
2
|
|
| 8120, 8736, 8784, 19140, 11200, 21750, 8624, 15950, 8120, 8736, 8784, 19140, 11200, 21750, 8624, 15950, 8120, 8736, 8784, 19140, 11200, 21750, 8624, 15950, 8120, 8736, 8784, 19140, 11200, 21750, 8624, 15950, 8120, 8736, 8784, 19140
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
(-1)sigma is defined in A049060. This is a cyclic sequence whose period is 8, so these numbers are called "(-1)sigma sociable numbers of order 8".
|
|
EXAMPLE
|
The numbers are 2^3*5*7*29, 2^5*3*7*13, 2^4*3^2*61, 2^2*3*5*11*29, 2^6*5^2*7, 2*3*5^3*29, 2^4*7^2*11, 2*5^2*11*29, then repeat.
|
|
CROSSREFS
|
Adjacent sequences: A126599 A126600 A126601 this_sequence A126603 A126604 A126605
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas, Feb 14 2008, based on a posting to the Sequence Fans Mailing List by Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), Feb 02 2005
|
|
|
Search completed in 0.002 seconds
|
