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A113909
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Square table of odd numbers which are neither squares nor one less than squares, read by antidiagonals.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| All such numbers may be written as n*(n+1)-k or n*(n+1)+k with k odd < n and n > 1.
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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
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CROSSREFS
| Sequence in context: A079498 A175100 A035035 * A111906 A101550 A136801
Adjacent sequences: A113906 A113907 A113908 * A113910 A113911 A113912
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KEYWORD
| nonn,tabl
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Jan 29 2006
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EXTENSIONS
| Edited by N. J. A. Sloane, Jul 18 2009
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