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Abundant Numbers
77th
Abundant Numbers (Long)
3rd
Arithmetic Numbers
69th
Ascending Primes
18th
Divisors
18th
Emirp Numbers
30th
Emirp Numbers (Long)
1st
Evil Numbers
1st
Evil Numbers (Long)
1st
Factorial Factorisation
28th
Fibonacci
1st
Happy Numbers
290th
Happy Numbers (Long)
2nd
ISBN
14th
Leap Years
2,120th
Look and Say
3rd
Lucky Numbers
292nd
Niven Numbers
358th
Niven Numbers (Long)
2nd
Odious Numbers
1st
Odious Numbers (Long)
1st
Ordinal Numbers
351st
Pascal’s Triangle
1st
Pernicious Numbers
20th
Pernicious Numbers (Long)
57th
Prime Numbers
1st
Prime Numbers (Long)
1st
Quine
1st