Is the 71st power of 2 + 1 prime It is helpful for the responder to give an accurate answer

Not a prime number, divisible by 3
2^71=(2^7)*(2^64)
2^7 mod 10=8
2^64 mod 10=6
=>2^71 mod 10= 8
=>(2^71 +1 )mod 10 =9
=>10 ^ 0 bits = 9, divisible by 3
It has been verified by MATLAB,

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