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Search: id:A074234
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| A074234 |
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Number of nodes of integer unit lattice covered by integer right triangles. |
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+0
1
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| 12, 36, 43, 72, 79, 106, 120, 146, 180, 213, 245, 250, 252, 278, 309, 336, 376, 380, 432, 532, 540, 559, 597, 607, 660, 694, 786, 792, 815, 822, 910, 918, 920, 936, 1001, 1036, 1069, 1092, 1158, 1260, 1321, 1412, 1419, 1432, 1440, 1478, 1561, 1595, 1632
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Let the coordinates of the vertices of the integer right triangle with legs 3,4 be (0,0), (3,0) and (0,4). Then the number of points with integer coordinates, including those on the sides, is 12. This is the maximal number of nodes covered by the triangle 3,4,5. Increasing all three lengths m times leads to a number of covered nodes equal to 6m(m+1).
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EXAMPLE
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a(1) = 12 because integer right triangle with legs 3,4 can cover a maximum of 12 nodes of the integer unit lattice. a(3) = 43 because integer right triangle with legs 5,12 can cover a maximum of 43 nodes of the integer unit lattice.
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CROSSREFS
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Sequence in context: A008653 A038006 A073543 this_sequence A076515 A039317 A063298
Adjacent sequences: A074231 A074232 A074233 this_sequence A074235 A074236 A074237
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 18 2002
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