58893domain: NAppears in sequencesa(n) = 3^n - (3*n^2 + n + 2)/2.at n=10A061983Numbers n such that the decimal expansions of both n and n^2 have 3 as the digit with the smallest value and 9 as the digit with the largest value.at n=14A238553Numbers k such that (299*10^k + 1)/3 is prime.at n=23A294911