Abundant Numbers
4th
Abundant Numbers (Long)
1st
Arithmetic Numbers
4th
Ascending Primes
6th
Collatz
21st
Divisors
1st
Emirp Numbers
5th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
6th
Farey Sequence
4th
Fibonacci
1st
Happy Numbers
6th
Happy Numbers (Long)
2nd
Intersection
6th
Inventory Sequence
12th
ISBN
5th
Kolakoski Sequence
1st
Leap Years
23rd
Look and Say
1st
Lucky Numbers
9th
Niven Numbers
6th
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
5th
Pascal’s Triangle
1st
Pernicious Numbers
1st
Pernicious Numbers (Long)
9th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st