76157domain: NPropertiesPrimalityPrimeyesAppears in sequencesSuper-5 Numbers (5 * n^5 contains substring '55555' in its decimal expansion).at n=20A032745Number of binary rooted trees with n nodes and height at most 6.at n=28A036589phi(s(n^3)) is a square, where s(n) is sigma(n)-n (A001065).at n=27A063798Prime numbersat n=7497