679999domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = smallest prime q of form q=-1+(p+1)*10^w, where p is n-th prime, or 0 if there is no such prime.at n=18A055785Primes with digit sum = 49.at n=2A106779Primes p such that the sum of decimal digits of p is the sum of primes dividing p+1 (with repetition).at n=16A338972Prime numbersat n=55063