Abundant Numbers
15th
Abundant Numbers (Long)
15th
Arithmetic Numbers
60th
Ascending Primes
16th
Collatz
1,425th
Divisors
20th
Emirp Numbers
32nd
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
44th
Farey Sequence
424th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
16th
Intersection
36th
Inventory Sequence
38th
ISBN
15th
Kolakoski Sequence
1st
Leap Years
1,826th
Look and Say
3rd
Lucky Numbers
395th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
421st
Pascal’s Triangle
1st
Pernicious Numbers
29th
Pernicious Numbers (Long)
103rd
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st