Abundant Numbers
78th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
70th
Ascending Primes
19th
Collatz
968th
Divisors
18th
Emirp Numbers
31st
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
27th
Fibonacci
1st
Happy Numbers
300th
Happy Numbers (Long)
2nd
ISBN
14th
Leap Years
2,139th
Look and Say
3rd
Lucky Numbers
292nd
Niven Numbers
363rd
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
355th
Pascalβs Triangle
1st
Pernicious Numbers
20th
Pernicious Numbers (Long)
69th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st