Abundant Numbers
95th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
91st
Ascending Primes
27th
Collatz
1,157th
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
45th
Farey Sequence
379th
Fibonacci
1st
Happy Numbers
337th
Happy Numbers (Long)
27th
Intersection
29th
Inventory Sequence
39th
ISBN
19th
Kolakoski Sequence
1st
Leap Years
2,279th
Look and Say
3rd
Lucky Numbers
375th
Niven Numbers
463rd
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
413th
Pascal’s Triangle
1st
Pernicious Numbers
26th
Pernicious Numbers (Long)
88th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st