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their may be possibility of 5 and 7's so this would not works there......
- shivamchaudhary.iiita February 05, 2014i think process should be like this:-
a) find all unique factors of n less than 9,and try to reduce the d digit number(n) into a single digit one.means divide by smallest factor and if factor remains < 9^(d-1) accept that and replace n by n/factor and d--..
continue this till reached d = 1;