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EXAMPLE
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The integers coprime to a(1)=1 are: 1,2,3,4,5,6,7... The a(5)th=6th of these is 6. The integers coprime to a(2)=1 are: 1,2,3,4,5... The a(4)th=4th of these is 4. The integers coprime to a(3)=2 are: 1,3,5,7,... The a(3)rd=2nd of these is 3. The integers coprime to a(4)=4 are: 1,3,5,7,... The a(2)nd=1st of these is 1. And the integers coprime to a(5)=6 are: 1,5,7,... The a(1)st=1st of these is 1. So a(6) = 6 + 4 + 3 + 1 + 1 = 15.
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