5162221domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = ceiling(2^(n+1)/n).at n=25A053639a(n) = ceiling(4^n/n).at n=12A129788Number of (n+3)X(1+3) 0..1 arrays with each row and column divisible by 13, read as a binary number with top and left being the most significant bits.at n=22A262482Prime numbersat n=358990