160213domain: NAppears in sequences4th column of number array A083075.at n=26A083079a(n) = -1/3 * (u^n-1)*(v^n-1) with u = 1+sqrt(3), v = 1-sqrt(3).at n=12A305650Numbers k such that k + 6^t is semiprime for t = 0 to 9.at n=2A330508