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A126696
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Tenth-squares: floor(n/10)*ceiling(n/10).
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0
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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; internal format)
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OFFSET
| 0,12
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FORMULA
| Equivalently, floor(n^2/100).
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MATHEMATICA
| f[n_]:=Module[{c=n/10}, Floor[c]Ceiling[c]]; f[Range[0, 90]] (* From Harvey P. Dale, Apr 04 2011 *)
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PROG
| (MAGMA) [ Floor(n/10)*Ceiling(n/10) : n in [0..100]];
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CROSSREFS
| Cf. A002620, A024206, A072280, A002984, A007590, A000212, A118015, A056827, A118013.
Sequence in context: A032572 A032574 A058515 * A164898 A100801 A194310
Adjacent sequences: A126693 A126694 A126695 * A126697 A126698 A126699
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KEYWORD
| easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), May 27 2007
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