Abundant Numbers
87th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
91st
Ascending Primes
27th
Collatz
1,140th
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
49th
Farey Sequence
376th
Fibonacci
1st
Happy Numbers
338th
Happy Numbers (Long)
27th
Intersection
32nd
Inventory Sequence
38th
ISBN
18th
Leap Years
2,262nd
Look and Say
3rd
Lucky Numbers
368th
Niven Numbers
521st
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