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way2ashish
- Senior | Next Rank: 100 Posts
- Posts: 32
- Joined: Mon Sep 26, 2011 6:34 pm
(4^5 - 16) = (4^5 - 4^2) = (4^2)*(4^3 - 1) = (2^4)*(64 - 1) = (2^4)*63 = (2^4)*7*9 = (2^4)*(3^2)*7way2ashish wrote:Q) What is the greatest prime factor of 4^5 - 16?
Hence, the greatest prime factor of (4^5 - 16) is 7
