You may want to specify if numbers containing the digit zero (on the premise that the 0th prime is 1) are to be allowed. > On Apr 10, 2015, at 7:01 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote: > > 12 is divisible by the 1st and the 2nd prime > 14 is divisible by the 1st and the 4th prime > 42 is divisible by the 4th and the 2nd prime