277630domain: NAppears in sequencesCoefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=22A192959Numbers k such that k^2 + {1,3,7,13} are prime.at n=23A356109Numbers k such that k^2 + {1,3,7,13,163} are prime.at n=11A356175