245251domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are concatenations of k with k + 6.at n=34A032629Lucky numbers that are decimal concatenations of n with n + 6.at n=26A032656Number of ways to split 1, 2, 3, ..., 5n into n arithmetic progressions each with 5 terms.at n=15A104431Prime numbersat n=21650