69007domain: NAppears in sequencesa(n) = T(2*n+1, n+3), T given by A027011.at n=6A027018Numbers k such that k^2 is composed of three 1-digit-overlapping subsquares.at n=16A048426Semiprimes n such that 3*n + 4 is a square.at n=38A112666Pyramid game person numbers that have integer solutions.at n=46A135051