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Prime Numbers
2, 3, 5, 7, ... The set of prime numbers is the alphabet of mathematics that allows us to communicate across the universe.
\[2^{2014}+ 1007^4\] Is this sum equal to a prime number?
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by
Joshua Ong
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.
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by
Drop TheProblem
A three-digit number \(N\) has first digit \(a (\neq 0)\), second digit \(b\) and third digit \(c\). \(N = b(10c + b)\) where \(b\) and \((10c + b)\) are primes. Find \(N\).
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by
Sharky Kesa
How many integers from \(1\) to \(100\) 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!
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by
Finn Hulse
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by
Chung Kevin