92239871domain: NPropertiesPrimalityPrimeyesAppears in sequencesFor numbers x_n coprime to 10 there exist infinitely many binary numbers b such that gcd(b,rev(b)) = x_n and digitsum(b) = x_n. a(n) is the smallest b converted to decimal that satisfies this constraint.at n=9A348480Prime numbersat n=5339294