176053domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that positive values of p - A002110(k) are all primes for k > 0.at n=30A068374a(n) is the first prime p such that the concatenations of n consecutive primes, starting with p, in both forward and backward directions, are prime.at n=18A384958Prime numbersat n=15998