79492domain: NAppears in sequencesPisot sequence T(6,10), a(n) = floor(a(n-1)^2/a(n-2)).at n=22A020741Numbers k such that 7*10^k + 6*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A103064