Abundant Numbers
86th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
89th
Ascending Primes
27th
Collatz
1,120th
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
48th
Farey Sequence
369th
Fibonacci
1st
Happy Numbers
333rd
Happy Numbers (Long)
26th
Inventory Sequence
792nd
ISBN
15th
Leap Years
2,238th
Look and Say
3rd
Lucky Numbers
363rd
Niven Numbers
518th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
408th
Pascal’s Triangle
1st
Pernicious Numbers
25th
Pernicious Numbers (Long)
88th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st