47213domain: NAppears in sequencesIntegers n not of form 3m+1 such that for any integer k>0, n*10^k-1 has a divisor in the set { 7, 11, 13, 37 }.at n=9A243974Numbers k such that w(k), w(k+1), and w(k+2) are all odd, where w is A336957.at n=17A337644