2051297326
domain: N
Appears in sequences
- Numbers that are n-gons for three or more n's, where n=3,4,5,...,16.at n=28A062712
- Sophie Germain triangular numbers tr: 2*tr+1 is also a triangular number.at n=13A124174
- Integers that are simultaneously triangular (A000217) and decagonal (A001107).at n=7A133216
- Decagonal hexagonal numbers.at n=3A203134
- Sequences A124174 and A006454 interlaced.at n=26A217278