120021

Appears in sequences

• a(1) = 1, a(n) = smallest palindrome not included earlier such that a(1)+...+a(n) is a palindrome.at n=37A073880
• The n-th row of the following array contains all palindromes, with at most n digits, with digit sum n. Sequence contains the array by rows.at n=33A109858
• Palindromes in base 3 (written in base 3).at n=41A118594
• Digitally balanced numbers: ternary numbers which have the same number of 0's as 1's as 2's.at n=23A181986
• Templates for lunar primes in any base (version 3).at n=25A191420
• Palindromes in base 16 whose squares are also palindromes.at n=40A241096