299977domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes with digit sum = 43.at n=19A106775Numbers k such that the Phi_3(10^10000+k) is prime, where Phi is a cyclic polynomial.at n=16A259631Primes of the form 299...977...7 with at least one 9 and one 7.at n=1A283209Prime numbersat n=25995