52782domain: NAppears in sequencesa(n) = A027052(n, 2n-5).at n=10A027061Number of length 1+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.at n=36A248462Numbers k such that (k*2^d + 1)*(d*2^k + 1) is semiprime for some divisor d of k.at n=19A382887