703243domain: NPropertiesPrimalityPrimeyesAppears in sequencesStarting from a(1)=2, a(n) = A028260(1+a(n-1)) if n is even, a(n) = A026424(a(n-1)) if n is odd.at n=18A160966Right hand diagonal of triangle A199476.at n=18A199477Prime numbersat n=56788