Abundant Numbers
3rd
Abundant Numbers (Long)
3rd
Catalan Numbers
1st
Christmas Trees
5th
Divisors
1st
Emirp Numbers
12th1st
Evil Numbers
1st
Fibonacci
Happy Numbers
10th
Leap Years
17th
Niven Numbers
5th
Niven Numbers (Long)
4th
Odious Numbers
1st
Pernicious Numbers
1st
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st