111191111

Properties

Appears in sequences

• Palindromic wing primes (a.k.a. near-repdigit palindromic primes) of the general form r*(10^d - 1)/9 + (m-r)*10^floor(d/2) where d is the number of digits (an odd number > 1), r is the repeated digit, and m (different from r) is the middle digit.at n=29A077798
• a(1) = 11; for n > 1, palindromic primes in which a single digit is sandwiched between strings of '1's.at n=11A088281
• Palindromic primes p(k) = palprime(k) such that their sum of digits ("sod") equals sum of digits of their palprime index k.at n=16A176465
• a(n) = (10^(2*n+1) - 1)/9 + 8*10^n.at n=4A332119
• Prime numbersat n=6367543