Guest 2, yours does not work because 9 is not a prime number.
The prime factorization of 1995, which is 3*5*7*19, uses each odd digit exactly one and 1995 is the smallest positive integer with this property. What is the next smallest?
Please show steps for solving.
1 and 9 are the only digits that is not prime so they have to be used in conjuction with digits
Mmm
maybe 3*5*7*91
No, 91 is not prime so that is not any good :(
So I want the smallest 3 digit number containing 9,1 and either 3,5,or 7
mabe 139*5*7
139 is prime :)
So I am going with 139*5*7 = 4865