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 N-th prime.
There is only one other such 10 digit number: can you find it?
(In reply to
A further analysis by Jer)
I , too, realised immediately that the problem
can be easily solved manually, probably within less than
1 hour {trying 210, 215,240, 245 ...etc) but decided
that there is no point in actually doing it...
I save my creativity for bigger challenges
ady
re: A further analysis
