1594403domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = smallest number that leads to a new cycle under the base-3 Kaprekar map of A164993.at n=27A165009Primes of the form 3^k + 3^m - 1, where k and m are positive integers.at n=32A234346Primes of the form m = 3^i + 3^j - 1, where i > j >= 0.at n=27A239713Prime numbersat n=120743