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(1) Total no. of positive integer ordered pairs of
which satisfy 
(2) Total no. of positive integer ordered pairs of
which satisfy 
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Hi ↑ stuart clark:,
See http://forum.matweb.cz/viewtopic.php?id=38817
http://en.wikipedia.org/wiki/Multiplici … s_triangle
and
http://oeis.org/A003016/b003016.txt .
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Stránky: 1