Abundant Numbers
101st
Abundant Numbers (Long)
3rd
Arithmetic Numbers
92nd
Ascending Primes
28th
Collatz
1,179th
Divisors
20th
Emirp Numbers
35th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
47th
Farey Sequence
389th
Fibonacci
1st
Happy Numbers
348th
Happy Numbers (Long)
27th
Intersection
30th
Inventory Sequence
42nd
ISBN
20th
Kolakoski Sequence
1st
Leap Years
2,238th
Look and Say
3rd
Lucky Numbers
394th
Niven Numbers
475th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
432nd
Pascal’s Triangle
1st
Pernicious Numbers
29th
Pernicious Numbers (Long)
95th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st