1023201domain: NAppears in sequencesPalindromes in which, in the first half of the number, digits appear in the order 1, 0, 2, 3, 1, 0, 2, 3, 1, ...at n=6A089183Palindromes with digit sum 9.at n=17A121476Smallest palindrome of each distinct decimal type (A002113) in increasing order.at n=25A264406