234860677domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = T(2n,n-3), T given by A026725.at n=12A026842a(n) = T(2n+1,n+4), T given by A026725.at n=12A026846a(n) = T(2n,n-3), T given by A026736.at n=12A026849Prime numbersat n=12894804