235211domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are a concatenation of 2, 3, 5 and a prime.at n=7A101251Numbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 5.at n=39A136968Numbers k such that the decimal expansions of both k and k^2 have 1 as smallest digit and 5 as largest digit.at n=15A256889Prime numbersat n=20851