37992domain: NAppears in sequencesNumbers k such that 10^k + 8*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=6A102945a(n) = 1728*n - 24.at n=21A157287Number of reduced 3 X 3 magilatin squares with magic sum n.at n=30A174020Expansion of ( (1 + 8*x)/(1 - x) )^(1/3).at n=7A372024