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A126696 Tenth-squares: floor(n/10)*ceiling(n/10). 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 9, 12, 12, 12, 12, 12, 12, 12, 12, 12, 16, 20, 20, 20, 20, 20, 20, 20, 20, 20, 25, 30, 30, 30, 30, 30, 30, 30, 30, 30, 36, 42, 42, 42, 42, 42, 42, 42, 42, 42, 49, 56, 56, 56, 56, 56, 56, 56, 56, 56 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,12
LINKS
FORMULA
Equivalently, floor(n^2/100).
MATHEMATICA
f[n_]:=Module[{c=n/10}, Floor[c]Ceiling[c]]; f[Range[0, 90]] (* Harvey P. Dale, Apr 04 2011 *)
PROG
(Magma) [ Floor(n/10)*Ceiling(n/10) : n in [0..100]];
CROSSREFS
Sequence in context: A327343 A032574 A058515 * A244464 A250201 A252375
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, May 27 2007
STATUS
approved

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Last modified March 28 14:02 EDT 2024. Contains 371254 sequences. (Running on oeis4.)