106649domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers n such that 3*10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=24A102980Coefficient of x in the reduction by (x^2->x+1) of the polynomial p(n,x) defined below at Comments.at n=16A192923Prime numbersat n=10162