771091domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmaller of two successive primes using the same digits such that the hundreds digit is the most significant digit to differ.at n=17A156117Primes p such that q=2*p^2-1, r=2*p*q-1 and 2*p*r-1 are also prime.at n=21A224991Prime numbersat n=61820