6300846559 is such that 6 is divisible by 2; 63, by 3; 630, by 5; 6300, by 7; and, in general, if you take its first N digits, it will be divisible by the Nth prime.
There is only one other such 10 digit number: can you find it?
(In reply to
re(3): Solution (VB program) by Charlie)
Thanks, Charlie.
I didn't know about this technique. I'll definitely check this out. It will make future programs a lot more concise.

Posted by Penny
on 20050104 20:03:37 