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EXAMPLE
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For example:
a(6,5) = 19 because the positive integers which are coprime to (5*6) are 1,7,11,13,17,19,23,29,... and the 6th of these is 19.
Array begins:
1, 3, 4, 7, 6,17, 8,15,13,23,12,35,14,...
1, 3, 7, 7,11,17,15,15,25,23,23,35,27,...
1, 5, 4,11, 8,17,11,23,13,37,17,35,20,...
1, 3, 7, 7,11,17,15,15,25,23,23,35,27,...
1, 3, 4, 9, 6,19, 9,19,16,23,14,43,17,...
1, 5, 7,11,17,17,23,23,25,37,35,35,41,...
1, 3, 4, 9, 6,19, 8,17,16,29,13,41,16,...
1, 3, 7, 7,11,17,15,15,25,23,23,35,27,...
1, 5, 4,11, 8,17,11,23,13,37,17,35,20,...
1, 3,11, 9,11,19,19,19,31,23,29,43,33,...
1, 3, 4, 7, 6,19, 8,17,14,27,12,37,15,...
1, 5, 7,11,17,17,23,23,25,37,35,35,41,...
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