147151domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are concatenations of k with k + 4.at n=15A032627Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines).at n=28A034819Prime partial sums of the odd-indexed primes.at n=18A096208Centered 25-gonal primes.at n=26A276264Prime numbersat n=13603