Euler problems/71 to 80
Problem 71
Listing reduced proper fractions in ascending order of size.
Solution:
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Problem 72
How many elements would be contained in the set of reduced proper fractions for d ≤ 1,000,000?
Solution:
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Problem 73
How many fractions lie between 1/3 and 1/2 in a sorted set of reduced proper fractions?
Solution:
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Problem 74
Determine the number of factorial chains that contain exactly sixty non-repeating terms.
Solution:
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Problem 75
Find the number of different lengths of wire can that can form a right angle triangle in only one way.
Solution:
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Problem 76
How many different ways can one hundred be written as a sum of at least two positive integers?
Solution:
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Problem 77
What is the first value which can be written as the sum of primes in over five thousand different ways?
Solution:
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Problem 78
Investigating the number of ways in which coins can be separated into piles.
Solution:
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Problem 79
By analysing a user's login attempts, can you determine the secret numeric passcode?
Solution:
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Problem 80
Calculating the digital sum of the decimal digits of irrational square roots.
Solution:
problem_80 = undefined