85666domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 3, 5, 6, 7 and 8.at n=11A137132Expansion of 2*(x+1)*(x^4+6*x^3+5*x^2+6*x+1)/(x^6-18*x^3+1).at n=10A247035Numbers k such that (10^k - 97)/3 is prime.at n=21A293757