Abundant Numbers
1st
Abundant Numbers (Long)
1st
Arithmetic Numbers
4th
Ascending Primes
8th
Chess Move Validation
6th
Collatz
23rd
Divisors
1st
Emirp Numbers
6th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
6th
Farey Sequence
5th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
2nd
Intersection
6th
Inventory Sequence
12th
ISBN
7th
Kolakoski Sequence
1st
Leap Years
26th
Look and Say
1st
Lucky Numbers
10th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
6th
Partition Numbers
11th
Pascal’s Triangle
1st
Pernicious Numbers
1st
Pernicious Numbers (Long)
9th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st
Recamán
12th
Scrambled Sort
4th
Ulam Sequence
6th