Abundant Numbers
101st
Abundant Numbers (Long)
3rd
Arithmetic Numbers
93rd
Ascending Primes
27th
Collatz
1,170th
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
45th
Farey Sequence
384th
Fibonacci
1st
Happy Numbers
340th
Happy Numbers (Long)
27th
Intersection
29th
Inventory Sequence
42nd
ISBN
19th
Kolakoski Sequence
1st
Leap Years
2,218th
Look and Say
3rd
Lucky Numbers
385th
Niven Numbers
467th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
418th
Pascal’s Triangle
1st
Pernicious Numbers
30th
Pernicious Numbers (Long)
94th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st