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Answer on Combinatorics | Number Theory Question for Janette

Question #42003
If p is a prime greater than 5, what are the possible values of p modulo 6?
Expert's answer
The p modulo 6 is the remainder of division of p by 6. 

p = 6*(p/6) + (p%6), 
where (p/6) is the integer quotient, and (p%6) is the modulo. 

In general, the range of numbers for an integer modulo of n is 0 to n  1. 

If p is a prime, this means p is divisible only by 1 and p. Since p is not divisible by 6, it would not leave a remainder of 0. 
Also, a prime can not leave a remainder of 2, because then it would be divisible by 2: 

p = 6*(p/6) + 2 = 2*(3*(p/6) + 1) and would not be a prime. 

For the same reason, the remainder 3 and 4 are not possible. 

Therefore, the possible modulos are 1 and 5. 

Answer: 1, 5. 

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