4194559domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = smallest number that leads to a new cycle under the base-4 Kaprekar map of A165012.at n=29A165029Primes of the form 4^k + 4^m - 1, where k and m are positive integers.at n=31A234310Primes of the form m = 4^i + 4^j - 1, where i > j >= 0.at n=25A239714Prime numbersat n=295965