Problem 71: Ordered fractions
Consider the fraction, n
/d
, where n
and d
are positive integers. If
n
<d
and HCF(n
,d
)=1, it is called a reduced proper fraction.
If we list the set of reduced proper fractions for d
≤ 8 in ascending order of
size, we get:
1/8, 1/7, 1/6, 1/5, 1/4, 2/7, 1/3, 3/8, 2/5, 3/7, 1/2, 4/7, 3/5, 5/8, 2/3, 5/7, 3/4, 4/5, 5/6, 6/7, 7/8
It can be seen that 2/5 is the fraction immediately to the left of 3/7.
By listing the set of reduced proper fractions for d
≤ 1,000,000 in ascending
order of size, find the numerator of the fraction immediately to the left of
3/7.
Test
{{test}}Console output