|
Search: id:A157756
|
|
|
| A157756 |
|
Integers n such that by splitting their digits in two equal parts, the difference between the square of the first part and the second part eventually reaches 0 by iterating the process. If length is odd, split (length+1)/2 , (length-1)/2 |
|
+0
1
|
|
| 0, 11, 24, 39, 45, 51, 74, 97, 103, 150, 151, 155, 220, 224, 225, 229, 230, 234, 240, 290
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Example 3480 belongs to the sequence, because 34^2-80 = 1076 --> 10^2-76 = 24 --> 2^2-4 = 0
Nice zoomable picture of the directed graph (up to 1000) :
http://vargo.chez.com/upto1000.jpg
or if you prefer a GIF :
http://vargo.chez.com/upto1000.gif
The terms up to 11000 :
http://vargo.chez.com/upto11000.txt
|
|
CROSSREFS
|
Sequence in context: A051909 A112134 A063307 this_sequence A061043 A098603 A053061
Adjacent sequences: A157753 A157754 A157755 this_sequence A157757 A157758 A157759
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Jean-Marc Falcoz (jeanmarcfalcoz(AT)vtxnet.ch), Mar 06 2009
|
|
|
Search completed in 0.002 seconds
|
