74227domain: NAppears in sequencesExpansion of 1/((1-2x)(1-9x)(1-12x)).at n=4A016324Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 33 ones.at n=23A031801Integers n such that p = 4n + 1, q = 4p + 3, r = 4q + 5, s = 4r + 7 and t = 4s + 9 are all prime.at n=8A243528