Abundant Numbers
13th
Abundant Numbers (Long)
13th
Arithmetic Numbers
60th
Ascending Primes
15th
Collatz
1,423rd
Divisors
19th
Emirp Numbers
31st
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
44th
Farey Sequence
417th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
16th
Intersection
34th
Inventory Sequence
35th
ISBN
14th
Kolakoski Sequence
1st
Leap Years
1,819th
Look and Say
3rd
Lucky Numbers
387th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
401st
Pascal’s Triangle
1st
Pernicious Numbers
30th
Pernicious Numbers (Long)
101st
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st