82878domain: NAppears in sequencesNumbers k such that 259*2^k+1 is prime.at n=4A032506Numbers k such that k and k^2 use only the digits 2, 4, 6, 7 and 8.at n=30A137101The continued fraction of the constant r > sqrt(3) such that the partial quotients equal the integer floor of the powers of r.at n=20A227233