30 (number) - Wikipedia
https://en.m.wikipedia.org/wiki/30_(number)
WEBIn mathematics. 30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of …
DA: 34 PA: 87 MOZ Rank: 32