92869domain: NAppears in sequencesNumbers n such that 5*10^n + 6*R_n - 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=25A103017Total number of words beginning with the first letter of an n-ary alphabet in all sets of nonempty words with a total of n letters.at n=6A292845