137743domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes with palindromic primes indices.at n=27A124173a(1) = 29. For n > 1, a(n) = smallest prime q such that q^(a(n-1)-1) == 1 (mod a(n-1)^2).at n=9A355599Prime numbersat n=12821