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A003990
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Table of lcm(x,y), read along antidiagonals.
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29
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1, 2, 2, 3, 2, 3, 4, 6, 6, 4, 5, 4, 3, 4, 5, 6, 10, 12, 12, 10, 6, 7, 6, 15, 4, 15, 6, 7, 8, 14, 6, 20, 20, 6, 14, 8, 9, 8, 21, 12, 5, 12, 21, 8, 9, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 11, 10, 9, 8, 35, 6, 35, 8, 9, 10, 11, 12, 22, 30, 36, 40, 42, 42, 40, 36, 30, 22, 12, 13, 12, 33, 20, 45, 24
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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LINKS
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Kival Ngaokrajang, Illustration of pattern, where terms with least significant decimal digit equal to zero are colored.
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EXAMPLE
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The symmetric array is lcm(x,y) = lcm(y,x):
1 2 3 4 5 6 7 8 9 10 ...
2 2 6 4 10 6 14 8 18 10 ...
3 6 3 12 15 6 21 24 9 30 ...
4 4 12 4 20 12 28 8 36 20 ...
5 10 15 20 5 30 35 40 45 10 ...
6 6 6 12 30 6 42 24 18 30 ...
7 14 21 28 35 42 7 56 63 70 ...
8 8 24 8 40 24 56 8 72 40 ...
9 18 9 36 45 18 63 72 9 90 ...
10 10 30 20 10 30 70 40 90 10 ...
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MATHEMATICA
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PROG
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(Haskell)
a003990 x y = a003990_adiag x !! (y-1)
a003990_adiag n = a003990_tabl !! (n-1)
a003990_tabl = zipWith (zipWith lcm) a002260_tabl $ map reverse a002260_tabl
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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