113468domain: NAppears in sequencesNumbers n such that 9*10^n + 6*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=23A103103The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {3,4,5} for all i from 1 to n-1.at n=16A174707