77777677777
domain: N
Appears in sequences
- Smallest prime beginning and ending in at least n 7's.at n=4A068162
- 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=31A077798
- Smallest palindromic prime containing exactly n 7's.at n=9A083978
- Palindromic primes in which a single digit is sandwiched between strings of 7's.at n=11A088283
- Palindromic wing primes that are also Lychrel candidates.at n=2A320516
- a(n) = 7*(10^(2*n+1) - 1)/9 - 10^n.at n=5A332176