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A331151
Triangle read by rows: T(n,k) (n>=k>=1) = ceiling((n/k)*floor(n/k)).
0
1, 4, 1, 9, 2, 1, 16, 4, 2, 1, 25, 5, 2, 2, 1, 36, 9, 4, 2, 2, 1, 49, 11, 5, 2, 2, 2, 1, 64, 16, 6, 4, 2, 2, 2, 1, 81, 18, 9, 5, 2, 2, 2, 2, 1, 100, 25, 10, 5, 4, 2, 2, 2, 2, 1, 121, 28, 11, 6, 5, 2, 2, 2, 2, 2, 1, 144, 36, 16, 9, 5, 4, 2, 2, 2, 2, 2, 1, 169, 39, 18, 10, 6, 5, 2, 2, 2, 2, 2, 2, 1
OFFSET
1,2
LINKS
Robert J. McEliece and Herbert Taylor, Covering tori with squares, Journal of Combinatorial Theory, Series A 14.1 (1973): 119-124.
EXAMPLE
Triangle begins:
1,
4, 1,
9, 2, 1,
16, 4, 2, 1,
25, 5, 2, 2, 1,
36, 9, 4, 2, 2, 1,
49, 11, 5, 2, 2, 2, 1,
64, 16, 6, 4, 2, 2, 2, 1,
81, 18, 9, 5, 2, 2, 2, 2, 1,
100, 25, 10, 5, 4, 2, 2, 2, 2, 1,
121, 28, 11, 6, 5, 2, 2, 2, 2, 2, 1,
144, 36, 16, 9, 5, 4, 2, 2, 2, 2, 2, 1,
169, 39, 18, 10, 6, 5, 2, 2, 2, 2, 2, 2, 1,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jan 14 2020
STATUS
approved