These are some famous conjectures, some of which have yet to be proved or disproved! Explore these conjectures with a partner. Then explain why you think the conjecture is true.
a. Any prime greater than 3 is within 1 unit of a multiple of 6.
b. Every even number can be expressed as the difference of two primes.
c. This conjecture comes from Fermat: Any prime number of the form p=4n+1, can be expressed as the sum of two squares in only one way.
d. This conjecture is called Goldbach’s conjecture after Christian Goldbach (1690–1764): Any even number greater than 2 can be expressed as the sum of two primes. To this day, no one has either found a counterexample or proved this conjecture.
e. Another conjecture made by Goldbach: Any odd number greater than 5 can be expressed as the sum of three prime numbers.
f. Every triangular number can be represented as the sum of a square number and two triangular numbers.
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