387420491domain: NAppears in sequencesNumbers of the form 3^n+2 which are not primes.at n=9A132830a(n) = smallest number that leads to a new cycle under the base-9 Kaprekar map of A165110.at n=14A165127a(n) = 3^n + 2.at n=18A168607a(n) = floor( (3^n+1)^2/3^n ).at n=18A259821