Arithmetic Numbers
256thAscending Primes
7thDivisors
18thEmirp Numbers
372ndEvil Numbers
1stEvil Numbers (Long)
1stFactorial Factorisation
6thFibonacci
1stHappy Numbers
1stHappy Numbers (Long)
1stISBN
5thLook and Say
42ndOdious Numbers
1stOdious Numbers (Long)
1stPascalβs Triangle
1stPrime Numbers
1stPrime Numbers (Long)
1st