Abundant Numbers
12th
Abundant Numbers (Long)
12th
Arithmetic Numbers
60th
Ascending Primes
15th
Collatz
1,385th
Divisors
19th
Emirp Numbers
30th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
40th
Farey Sequence
408th
Fibonacci
1st
Happy Numbers
1st
Happy Numbers (Long)
16th
Intersection
31st
Inventory Sequence
32nd
ISBN
12th
Leap Years
1,903rd
Look and Say
3rd
Lucky Numbers
370th
Niven Numbers
1st
Niven Numbers (Long)
1st
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
390th
Pascal’s Triangle
1st
Pernicious Numbers
25th
Pernicious Numbers (Long)
96th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st