10157893domain: NAppears in sequencesOdd integers n such that for every integer k>0, n*2^k-1 has a divisor in the set {3, 5, 7, 13, 17, 97, 257}.at n=0A244076Least k such that k*2^m - 1 has a covering set of modulus 2*n, or 0 if no such value exists.at n=23A258154