Abundant Numbers
12th
Abundant Numbers (Long)
12th
Arithmetic Numbers
53rd
Ascending Primes
15th
Collatz
1,353rd
Divisors
19th
Emirp Numbers
30th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
35th
Farey Sequence
400th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
1st
Inventory Sequence
777th
ISBN
9th
Leap Years
1,846th
Look and Say
3rd
Lucky Numbers
356th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
388th
Pascal’s Triangle
1st
Pernicious Numbers
24th
Pernicious Numbers (Long)
95th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
464th