238237domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes whose decimal expansion is a concatenation of two or more consecutive decreasing numbers (no leading zeros allowed).at n=29A052088Primes formed by concatenating k with k-1.at n=27A052089Primes p such that q=2*p^2-1, r=2*p*q-1 and 2*p*r-1 are also prime.at n=9A224991Prime numbersat n=21080