Number Theory

Prime Numbers

Prime Numbers: Level 3 Challenges


22014+100742^{2014}+ 1007^4 Is this sum equal to a prime number?

Mr. White is an approximately forty years old father with 4 sons of distinct ages. Writing his age 3 times in succession, we get a 6-digit number that is equal to the product of his age, his wife's age and his 4 sons' ages.

Give the sum of his wife's age and all 4 sons' ages.

A three-digit number NN has first digit a(0)a (\neq 0), second digit bb and third digit cc. N=b(10c+b)N = b(10c + b) where bb and (10c+b)(10c + b) are primes. Find NN.

How many integers from 11 to 100100 inclusive can be written as the product of two (not necessarily distinct) primes?

If you can find a computer science or combinatorics approach, post your solution!

What is the last digit of the largest prime number?

See Part 1, and Part 3.


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