A number which can be arranged in the shape of nested pentagons as shown in the figure. The sequence is 1, 5, 12, 22, 35,…which can be generated by for n ≥1.
First four pentagonal numbers
- Nimeiri, Gaafar Muhammad al- (1930–2009)
- Nimitz, Chester William (1885–1966)
- NIMS
- nine-point circle
- Nineveh
- Nine Years War (1688–97)
- nine’s complement
- ninhydrin
- niobite
- niobium
- nipple
- Nirenberg, Marshall Warren
- nirvana
- NIS
- N-ISDN
- Nishida Kitaro (1870–1945)
- Nishitani Keiji (1900–1990)
- Nissl granules
- NIST
- nisus
- nit
- nitisols
- nitrate
- nitratine
- nitrating mixture