Abundant Numbers
85th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
89th
Ascending Primes
27th
Collatz
1,101st
Divisors
19th
Emirp Numbers
34th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
48th
Farey Sequence
370th
Fibonacci
1st
Happy Numbers
328th
Happy Numbers (Long)
2nd
Inventory Sequence
784th
ISBN
15th
Leap Years
2,213th
Look and Say
3rd
Lucky Numbers
362nd
Niven Numbers
511th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
408th
Pascal’s Triangle
1st
Pernicious Numbers
24th
Pernicious Numbers (Long)
86th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st