72821domain: NAppears in sequencesNumbers k such that R_k + 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=11A097685Structured rhombic triacontahedral numbers (vertex structure 11).at n=20A100164Number of ways tiling a 2 X n rectangle with 2 X 1 (domino) and 3 X 1 (tromino) tiles.at n=17A129682