Euler problems/71 to 80
Listing reduced proper fractions in ascending order of size.
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How many elements would be contained in the set of reduced proper fractions for d ≤ 1,000,000?
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How many fractions lie between 1/3 and 1/2 in a sorted set of reduced proper fractions?
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Determine the number of factorial chains that contain exactly sixty non-repeating terms.
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Find the number of different lengths of wire can that can form a right angle triangle in only one way.
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How many different ways can one hundred be written as a sum of at least two positive integers?
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What is the first value which can be written as the sum of primes in over five thousand different ways?
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Investigating the number of ways in which coins can be separated into piles.
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By analysing a user's login attempts, can you determine the secret numeric passcode?
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10 Problem 80
Calculating the digital sum of the decimal digits of irrational square roots.
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