6990510

Appears in sequences

• Numbers k such that A003313(k) = A003313(9*k).at n=28A116463
• a(n) = 5*(-1)^n*A078008(n).at n=22A156550
• p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S^3)^2.at n=22A291014