Question 1065677
a) {{{N=8*9*8*7*6*5*4=483840}}}
b) {{{N=8*10^6=8000000}}}
c) Well wasted is kind of subjective, you lose 10000 numbers for each 3 digit special prefix (assuming repetition, {{{N=10*10*10*10}}} 
or 50400 without repetition). So 30000 lines wasted just to have potentially lifesaving response.