Divisibility rules for prime numbers between 30-50!!!

Hey guys,I’m back. I’ve been trying to figure out divisibility of other prime numbers till 50…Here they are…
*A number xy is said to be divisible by 31 if the difference between x and 3 times y is divisible by 31.(x-3y is divisible by 31)
For example; 341=>34-3(1)=31

Note that here, y MUST be a 1-digit number and x could be any digit.
Same applies for 37, 41, 43 and 47.(x-11y is divisible by 37)

*A number xy is said to be divisible by 37 if the difference between x and 11 times y is divisible by 37.
For example; 148=>14-11(8)=-74
*A number xy is said to be divisible by 41 if the difference between x and 4 times y is divisible by 41.(x-4y is divisible by 41)
For example; 1681=>168-4(1)=164
*A number xy is said to be divisible by 43 if the sum of x and 13 times y is divisible by 43.(x 13y is divisible by 43)
For example; 473=>47 – 13(3)=86
*A number xy is said to be divisible by 47 if the difference between x and 14 times y is divisible by 47.(x-14y is divisible by 47)

This evening, I’ll be releasing a new set of divisibility rules for prime numbers between 50-100!!!

Stay tuned!!!
One Love!!!

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