193493domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of base 27 circular n-digit numbers with adjacent digits differing by 2 or less.at n=7A124955G.f. satisfies A(x) = 1 + x/(1 - x^4) * A(x/(1 - x^4)).at n=22A360891Prime numbersat n=17455