### Project Euler – Problem 24

Problem 24: What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

### Project Euler – Problem 23

Problem 23: Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers.

### Project Euler – Problem 22

Problem 22: Using names.txt, a 46K text file containing over five-thousand first names, begin by sorting it into alphabetical order. Then working out the alphabetical value for each name, multiply this value by its alphabetical position in the list to obtain a name score.

What is the total of all the name scores in the file?

### Project Euler – Problem 21

Problem 21: Evaluate the sum of all amicable pairs under 10000.

### Project Euler – Problem 20

Problem 20: Find the sum of the digits in the number 100!

### Project Euler – Problem 19

Problem 19: How many Sundays fell on the first of the month during the twentieth century?

### Project Euler – Problem 67

Problem 67: Find the maximum total from top to bottom in triangle.txt, a 15K text file containing a triangle with one-hundred rows.

### Project Euler – Problem 18

Problem 18: Find the maximum sum travelling from the top of the triangle to the base.

### Project Euler – Problem 17

Problem 17:
If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.

If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?

### Project Euler – Problem 16

Problem 16: What is the sum of the digits of the number 2^1000?