Abundant Numbers
81st
Abundant Numbers (Long)
3rd
Arithmetic Numbers
79th
Ascending Primes
24th
Collatz
1,060th
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
46th
Farey Sequence
343rd
Fibonacci
1st
Happy Numbers
302nd
Happy Numbers (Long)
2nd
Inventory Sequence
744th
ISBN
15th
Leap Years
2,167th
Look and Say
3rd
Lucky Numbers
329th
Niven Numbers
504th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
400th
Pascal’s Triangle
1st
Pernicious Numbers
23rd
Pernicious Numbers (Long)
81st
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
450th