60809domain: NAppears in sequencesNumbers that look the same when printed upside down.at n=24A111156Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+511)^2 = y^2.at n=27A207078E.g.f.: exp((1+x)^(1+x)-1).at n=8A211193Strobogrammatic nonpalindromic numbers.at n=30A287092