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* 199 is a prime number, a twin prime with 197, and also a permutable prime.
* Coming at the end of a prime quadruplet, 199 sets a record low of the Mertens function, -8.
* 199 is the sum of three consecutive primes (61 + 67 + 71) as well as the sum of five consecutive primes (31 + 37 + 41 + 43 + 47).
* 199 is a Lucas number, a centered triangular number and a Chen prime.