Primes or Palindromes?

Revision en1, by gXa, 2015-08-22 16:42:18

Can anybody plz explain why the upper bound of n in problem Primes or Palindromes? is 10^7. I have spent a whole day but coul not figure out. Plz can someone explain rigourously.

Tags codeforces, codeforces round #315

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en1 English gXa 2015-08-22 16:42:18 248 Initial revision (published)