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Euler problems/31 to 40

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1 Problem 31

Investigating combinations of English currency denominations.


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2 Problem 32

Find the sum of all numbers that can be written as pandigital products.


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3 Problem 33

Discover all the fractions with an unorthodox cancelling method.


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4 Problem 34

Find the sum of all numbers which are equal to the sum of the factorial of their digits.


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5 Problem 35

How many circular primes are there below one million?


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6 Problem 36

Find the sum of all numbers less than one million, which are palindromic in base 10 and base 2.


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7 Problem 37

Find the sum of all eleven primes that are both truncatable from left to right and right to left.


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8 Problem 38

What is the largest 1 to 9 pandigital that can be formed by multiplying a fixed number by 1, 2, 3, ... ?


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9 Problem 39

If p is the perimeter of a right angle triangle, {a, b, c}, which value, for p ≤ 1000, has the most solutions?


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10 Problem 40

Finding the nth digit of the fractional part of the irrational number.


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