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A061859
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Differences between the ordinary multiplication table A004247 and Xmult table A048720, computed for {3..n} * {3..n}.
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4, 0, 0, 0, 0, 0, 8, 0, 0, 8, 12, 0, 8, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 8, 16, 8, 0, 0, 0, 0, 0, 24, 24, 0, 0, 0, 4, 0, 0, 0, 28, 0, 0, 0, 4, 16, 0, 16, 0, 0, 0, 0, 16, 0, 16, 16, 0, 16, 0, 0, 0, 0, 0, 16, 0, 16, 24, 0, 0, 8, 16, 0, 0, 16, 8, 0, 0, 24, 28, 0, 8, 32, 28, 0, 16, 0, 28, 32, 8, 0, 28
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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MAPLE
| [seq(diff_mult_Xmult_table3(j), j=0..119)]; diff_mult_Xmult_table3 := (n) -> (mult_table3(n) - Xmult_table3(n));
mult_table3 := (n) -> floor(evalf(((((trinv(n)-1)*(((1/2)*trinv(n))+1))-n)+3) * (3+(n-((trinv(n)*(trinv(n)-1))/2))) ));
Xmult_table3 := (n) -> Xmult( ((((trinv(n)-1)*(((1/2)*trinv(n))+1))-n)+3), (3+(n-((trinv(n)*(trinv(n)-1))/2))) );
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CROSSREFS
| Cf. "Zoomed out" variant: A061858, trinv given at A054425. The first, third and fifth diagonals are given by A048728-A048730.
Sequence in context: A075444 A089371 A133886 * A108708 A005925 A070206
Adjacent sequences: A061856 A061857 A061858 * A061860 A061861 A061862
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KEYWORD
| nonn,tabl
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AUTHOR
| Antti Karttunen May 11 2001
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