8388620domain: NAppears in sequences(Smallest prime >= 2^n) + (largest prime <= 2^n).at n=22A092507a(n) = 2^n + ceiling(n/2).at n=23A134522a(n) = 2^(2*n - 1) + n.at n=11A221130Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime.at n=9A254203