Question 319408
Find a counterexample to the statement:
 The cube of a number added to the sum of three times the number and 3 is a prime number. 
:
x = "number"
the equation
y = x^3 + 3x + 3
:
Substituting:
x = 1, then y = 7, a prime number
x = 2, then y = 17, a prime number
however,
x = 3, then y = 39, not a prime number