674541
domain: N
Appears in sequences
- 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=26A024391
- Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.at n=37A068889
- Hexagonal numbers (A000384) in which parity of digits alternates.at n=35A297645