Prove that 1000....001 with 1961 zeroes is a composite number
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You see , 1001 is divisible by 11.
100001 is divisible by 11.
10000001 is divisble by 11.
So , we can say that if a number has an ODD number of zeros with 1 at the beginning and end , it is divisible by 11 ...
i.e. , it is a composite number .
THUS ,
1000...001 with 1961 zeros is a composite number .
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