An integer of the form , where n is a positive integer. The first few triangular numbers are 1, 3, 6, 10, and 15, and the reason for the name can be seen from the figure.
First five triangular numbers
See also pentagonal number, tetrahedral number.
- taxon range zone
- tax planning
- Tax Reform Act
- tax refund
- tax relief
- tax return
- tax schedule
- tax shelter
- tax shifting
- tax threshold
- tax wedge
- Taylor, Brook
- Taylor, Brook (1685–1731)
- Taylor bubble
- Taylor, Charles (1931–)
- Taylor contract
- Taylor expansion
- Taylor, Frank Bursley (1860–1939)
- Taylor, Harriet (1807–58)
- Taylorism
- Taylor, Joseph Hooton
- Taylor number
- Taylor, Richard
- Taylor, Richard (1962–)
- Taylor rule