5911641
domain: N
Appears in sequences
- Triangular numbers whose digit reversal is also a triangular number.at n=39A061455
- Non-palindromic triangular numbers whose reverse is a triangular number with the same number of digits.at n=7A066528
- Triangular numbers whose reverse is also triangular.at n=27A066569
- Nonpalindromic triangular numbers whose digit reversal is also a triangular number (possibly with fewer digits).at n=18A069673
- Triangular numbers n such that psi(n) is also a triangular number, where psi is the Dedekind psi function (A001615).at n=8A292063