631273domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes expressible as concatenation of reversals of two consecutive squares, in order of their occurrence (ignoring leading zeros).at n=7A228134Primes p such that 1000p+1, 1000p+3, 1000p+7 and 1000p+9 are prime.at n=21A242562Prime numbersat n=51428