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Show that 11111111111111111111111111......1 (91times) is not a prime number. Show that 11111111111111111111111111......1 (91times) is not a prime number.
11111111.....(91 times) is a composite number.Because it is divisible by 1111111. Proof-11111.....(91 times) can be expressed as- = 1/9 * (1091 - 1) = 1/9 * (107 - 1) * x = 1111111 * xWhere x = (107)12 + (107)11.....+ 1
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