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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 198 is the first number between a twin prime pair such that if multiplied by its reversal (198 * 891) does the same! [Luhn] 198 can be formed by concatenating 19 and 8. Note that 19 is the 8th prime number. Curiously, 198 is the (19*8)nd composite number! [Fazely] The difference between any odddigit emirp pairs is divisible by 198. [Green]
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