|
Search: id:A113909
|
|
|
| A113909 |
|
Square table of odd numbers which are neither squares nor one less than squares, read by antidiagonals. |
|
+0
1
|
|
| 5, 7, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 45, 47, 51, 53, 55, 57, 59, 61, 65, 67, 69, 71, 73, 75, 77, 79, 83, 85, 87, 89, 91, 93, 95, 97, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 123, 125, 127, 129, 131
(list; table; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
All such numbers may be written as n*(n+1)-k or n*(n+1)+k with k odd < n and n > 1.
|
|
FORMULA
|
for l=1 to n for c=l to n T(l, c)=(l+c)*(l+c+1)-2*l+1 next c next l for c=1 to n for l=c+1 to n T(l, c)=(l+c-1)*(l+c)+2*c-1 next l next c
|
|
CROSSREFS
|
Sequence in context: A113837 A079498 A035035 this_sequence A111906 A101550 A136801
Adjacent sequences: A113906 A113907 A113908 this_sequence A113910 A113911 A113912
|
|
KEYWORD
|
nonn,tabl
|
|
AUTHOR
|
Pierre CAMI (pierrecami(AT)tele2.fr), Jan 29 2006
|
|
EXTENSIONS
|
Edited by N. J. A. Sloane, Jul 18 2009
|
|
|
Search completed in 0.002 seconds
|
