282827domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes whose consecutive digits differ by 5 or 6.at n=36A048417Numbers k such that k and k^2 use only the digits 1, 2, 7, 8 and 9.at n=22A137018a(n) = 729*n^2 - 442*n + 67.at n=19A157668Prime numbersat n=24667