56665domain: NAppears in sequencesPalindromes n such that n and n^2 have same digit sum.at n=15A058852Palindromes p = A002113(n) whose index n is a substring of p.at n=6A248753Palindromes p=A002113(n) whose index n is also a palindrome and in addition a substring of p (strings in base 10).at n=6A248754