Expressing Prime Num3ers using all digits from 1 to 9 only once

**From 1 to 9:**

**(-1) + 2 – 3 – (4 * 5) + (6 * 7) + 8 + 9 = 37** is a prime number

**1 – 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 41** is a prime number

**(1*2*3*4) + 5 + 6 + 7 + 8 + 9 = 59** is a prime number

**(1*2) + (3*4) + (5*6) + (7*8) + 9 = 109** is a prime number

**From 9 to 1:**

**(9*8) + (7*6) + (5*4) + (3*2) – 1 = 139** is a prime number

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## About benvitalis

math grad - Interest: Number theory

1 + 2 – 3 – 4 + 5 + 6 + 7 + 8 + 9 = 31