764501domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 69.at n=22A031657Growth series for affine Coxeter group (or affine Weyl group) D_7.at n=21A266762Prime numbersat n=61318