2347506domain: NAppears in sequencesNumbers in base 10 that are palindromic in bases 4 and 5.at n=8A097929a(n) = sigma((7^n - 1)/6), where sigma(n) is the sum of positive divisors of n.at n=7A102360Numbers that are nontrivially palindromic in two or more consecutive integer bases with non-constant number of digits .at n=23A327810