Natural number
147 (one hundred [and] forty-seven ) is thenatural number following146 and preceding148 .
147 is the fourthcentered icosahedral number . These are a class offigurate numbers that represent points in the shape of aregular icosahedron or alternatively points in the shape of acuboctahedron , and aremagic numbers for theface-centered cubic lattice .[ 1] diamond cubic .[ 2]
It is also the fourth Apéry numbera 3 {\displaystyle a_{3}} 19 , where[ 3] a n = ∑ k = 0 n ( n k ) 2 ( n + k k ) , {\displaystyle a_{n}=\sum _{k=0}^{n}{\binom {n}{k}}^{2}{\binom {n+k}{k}},}
with 147 thecomposite index of the nineteenthtriangle number ,190 .[ 4] [ 5]
There are 147 different ways of representing one as asum of unit fractions with five terms, allowing repeated fractions,[ 6] polygonal chains of length six using horizontal and vertical segments of theinteger lattice .[ 7]
400 to 999
400s, 500s, and 600s 700s, 800s, and 900s
1000s and 10,000s
1000s 10,000s
100,000s to 10,000,000,000,000s
100,000 1,000,000 10,000,000 100,000,000 1,000,000,000 10,000,000,000 100,000,000,000 1,000,000,000,000 10,000,000,000,000
