Abundant Numbers
12th
Abundant Numbers (Long)
12th
Arithmetic Numbers
59th
Ascending Primes
15th
Collatz
1,367th
Divisors
19th
Emirp Numbers
30th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
40th
Farey Sequence
402nd
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
16th
Inventory Sequence
796th
ISBN
9th
Leap Years
1,882nd
Look and Say
3rd
Lucky Numbers
362nd
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
387th
Pascal’s Triangle
1st
Pernicious Numbers
25th
Pernicious Numbers (Long)
96th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st