Problem Solving :: RE: GmatPrep?? (function)

f(n) = number of positive integers less than n, no factor with n except 1 f(6) = 5 ie 1 number f(8) = 3,5,7 ie 3 numbers p is a prime number f(p) f(7) = 2,3,4,5,6 ie 5 numbers 7-2 = 5 (p-2) f(13) = 2,3,4,5,6,7,8,9,10,11,12. ie 11 ...

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