399171
domain: N
Appears in sequences
- Triangular numbers with only odd digits.at n=30A117960
- Numbers that are palindromic in bases 2 and 7.at n=12A182234
- Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.at n=17A229262
- Triangular numbers that are binary palindromes.at n=21A350987
- Triangular numbers that are palindromes in base 7.at n=13A350992