3769453domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime factor of the semiprime 2^A165767(n)-A165767(n).at n=9A165768Least prime divisor of 2^n - n which does not divide any 2^k - k with 0 < k < n, or 1 if such a primitive prime divisor of 2^n - n does not exist.at n=44A242292Prime numbersat n=267980