71617domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1) * A026714(n, k).at n=11A027205Base-10 palindromes that start with 7.at n=38A043042Largest palindromic substring in 8^n.at n=25A046266Palindromic composite numbers starting with a digit 7.at n=29A222728