// archives

## Solutions 60-69

This category contains 10 posts

### Project Euler Problem 60 Solution

Find a set of five primes for which any two primes concatenate to produce another prime.

### Project Euler Problem 61 Solution

Find the sum of the only set of six 4-digit figurate numbers with a cyclic property.

### Project Euler Problem 62 Solution

Find the smallest cube for which exactly five permutations of its digits are cube.

### Project Euler Problem 63 Solution

How many n-digit positive integers exist which are also an nth power?

### Project Euler Problem 64 Solution

How many continued fractions for N ≤ 10000 have an odd period?

### Project Euler Problem 65 Solution

Find the sum of digits in the numerator of the 100th convergent of the continued fraction for e.

### Project Euler Problem 66 Solution

Investigate the Diophantine equation x2 − Dy2 = 1.

### Project Euler Problem 67 Solution

Using an efficient algorithm find the maximal sum in the triangle?

### Project Euler Problem 68 Solution

What is the maximum 16-digit string for a “magic” 5-gon ring?

### Project Euler Problem 69 Solution

Find the value of n ≤ 1,000,000 for which n/φ(n) is a maximum.