Yielding a Composite Number

A formula that yields prime numbers. One such formula was x^2 - x + 41. Select some numbers for x, substitute them in the formula, and see if prime numbers occur. Try to find a number for x that when substituted in the formula yields a composite number.

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p(2) = 2^2 - 2 + 41 = 43 (Prime)

p(3) = 3^2 - 3 + 41 = 47 (Prime)

p(5) = 5^2 - 5 + 41 = 61 (Prime)

p(7) = 7^2 - 7 + 41 = 83 ...