36018domain: NAppears in sequencesTotal number of palindromic primes in base 7 below 7^n.at n=12A117783Total number of palindromic primes in base 7 below 7^n.at n=13A117783Numbers k such that w(k-2), w(k-1), and w(k) are all odd, where w is A336957.at n=12A338070