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Find all whole numbers m such that m and 5m+1 are prime numbers.

User Ben Miller
by
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1 Answer

4 votes

Answer:

2 only

Explanation:

Only even PRIME number is 2.

Why do we need EVEN PRIME numbers?

Say we do 11*5 we get 55 but when we add one we get 56

Meaning: An odd number multiplied by an odd number plus an odd number equals EVEN number which isn't PRIME. 2 being the ONLY even prime is therefore the only number we can choose.

User Lascarayf
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