+23 Find the largest prime factor of 1,005,010,010,005,001. (Without a computer of course).
+964 To find the largest prime factor of 1,005,010,010,005,001, we can start by checking if it is divisible by 2.
1,005,010,010,005,001 is an odd number, so it is not divisible by 2.
Next, we can check if it is divisible by 3.
By adding up the digits of 1,005,010,010,005,001, we get:
1 + 0 + 0 + 5 + 0 + 1 + 0 + 1 + 0 + 0 + 5 + 0 + 0 + 0 + 1 = 13
Since 13 is not divisible by 3, the number 1,005,010,010,005,001 is also not divisible by 3.
Continuing this process, we find that 1,005,010,010,005,001 is divisible by 307, which is a prime number.
So, the largest prime factor of 1,005,010,010,005,001 is 307.
