Abundant Numbers
12th
Abundant Numbers (Long)
12th
Arithmetic Numbers
65th
Ascending Primes
27th
Collatz
1,403rd
Divisors
19th
Emirp Numbers
27th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
35th
Farey Sequence
362nd
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
1st
Inventory Sequence
836th
ISBN
9th
Leap Years
1,761st
Look and Say
3rd
Lucky Numbers
326th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
382nd
Pascal’s Triangle
1st
Pernicious Numbers
21st
Pernicious Numbers (Long)
82nd
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st