866969domain: NPropertiesPrimalityPrimeyesAppears in sequencesEvery digit of prime and its index contains a loop (only digits 0,4,6,8,9 in prime and its index).at n=22A107625Denominators of r-Egyptian fraction expansion for sqrt(1/3), where r(k) = 1/(2k-1).at n=4A270547Prime numbersat n=68864