Abundant Numbers
12th
Abundant Numbers (Long)
12th
Arithmetic Numbers
65th
Ascending Primes
28th
Collatz
1,435th
Divisors
19th
Emirp Numbers
27th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
35th
Farey Sequence
376th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
1st
Inventory Sequence
747th
ISBN
9th
Leap Years
1,808th
Look and Say
3rd
Lucky Numbers
331st
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
386th
Pascal’s Triangle
1st
Pernicious Numbers
23rd
Pernicious Numbers (Long)
89th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
450th