- 1: Multiples of 3 or 5
- 2: Even Fibonacci numbers
- 3: Largest prime factor
- 4: Largest palindrome product
- 5: Smallest multiple
- 6: Sum square multiples
- 7: 10001st Prime
- 8: Largest product in a series
- 9: Special Pythagorean triplet
- 10: Summation of Primes
- 11: Largest product in a grid
- 13: Large sum
- 14: Longest Collatz sequence
- 15: Lattice paths
- 16: Power digit sum
- 17: Number letter counts