Math question - Prime Numbers

by Lisa
(NJ)

generate a equation using at least five numbers; 0 (zero), two even, and two odd to get a prime number. For example; (a) x = 0 => x2 – x + 41 = 0 – 0 + 41 = 41, which is prime. (b) Two even:

x = 2 => x2 – x + 41 = 22 – 2 + 41 = 4 – 2 + 41 = 43, which is prime. x = 4 =>

x2 – x + 41 = 42 – 4 + 41 = 16 – 4 + 41 = 53, which is prime. (c) Two odd: x = 1 =>

x2 – x + 41 = 12 – 1 + 41 = 1 – 1 + 41 = 41, which is prime. x = 3 => x2 – x + 41 =

9 – 3 + 41 = 6 + 41 = 47, which is prime.

Comments for Math question - Prime Numbers

 May 22, 2011 Prime Number Equation by: Staff The question: by Lisa (NJ) generate a equation using at least five numbers; 0 (zero), two even, and two odd to get a prime number. For example; (a) x = 0 => x2 – x + 41 = 0 – 0 + 41 = 41, which is prime. (b) Two even: x = 2 => x2 – x + 41 = 22 – 2 + 41 = 4 – 2 + 41 = 43, which is prime. x = 4 => x2 – x + 41 = 42 – 4 + 41 = 16 – 4 + 41 = 53, which is prime. (c) Two odd: x = 1 => x2 – x + 41 = 12 – 1 + 41 = 1 – 1 + 41 = 41, which is prime. x = 3 => x2 – x + 41 = 9 – 3 + 41 = 6 + 41 = 47, which is prime. The answer: (a) x = 0 => x + 2 = 0 + 2 = 2, which is prime. (b) Two even: x = 4 => sqrt(x) + 9 = sqrt(4) + 9 = 2 + 9 = 11, which is prime. x = 64 => x^(1/3) - 1 = 64^(1/3) - 1 = 4 - 1 = 3, which is prime. (c) Two odd: x = 13 =>39/x = 39/13 = 3, which is prime x = 7 =>3(x + 5) + 5 = 3(7 + 5) + 5 = 3*12 + 5 = 36 + 5 = 41, which is prime Thanks for writing. Staff www.solving-math-problems.com

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