hey, i hav an interesting question. I tried to work this question out using AP series, and the answer i got is 301. tell me where did i go wrong.
2^10 ----> 4 digits
2^20-----> 7 digits
2^30-----> 10 digits
ie term1=4 , and common difference is 3
it seems to work for 2^30 ie n=3. so...