The Prime Numbers below 75

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?




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Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.