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EXAMPLE
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The integers coprime to 5 are 1,2,3,4,6,.. The a(1)th=1st of these is 1. The integers coprime to 4 are 1,3,5,.. The a(2)th=1st of these is 1. The integers coprime to 3 are 1,2,4,5,.. The a(3)th=2nd of these is 2. The integers coprime to 2 are 1,3,5,7,9,.. The a(4)th=4th of these is 7. And the integers coprime to 1 are 1,2,3,4,5,6,7,8,9,10,.. The a(5)th=9th of these is 9. So a(6) = 1 + 1 + 2 + 7 + 9 = 20.
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