145

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145 < 144 | 146 >
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120	121	122	123	124	125	126	127	128	129
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140	141	142	143	144	145	146	147	148	149
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180	181	182	183	184	185	186	187	188	189
190	191	192	193	194	195	196	197	198	199

145 is the number following 144 and preceding 146.

Properties

• Its factors are 1, 5, 29 and 145, making it a composite number. It is also a squarefree number.
• 145 is an odd number .
• 145 is an unhappy number.
  

• 145 is a centered square number.
  
• 145 is a pentagonal number.
  
• 145 is deficient.
  
• Its prime factorization is 5¹ × 29¹.
  
• 145 = 1! + 4! + 5!.

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	12 ↑ 2
Scientific notation	1.45 x 102	1.451 x 102
Slow-growing hierarchy	\(g_{\omega^{\omega}}(3)\)	\(g_{\omega^{\omega}}(4)\)
Copy notation	1[3]	2[3]
Chained arrow notation	12 → 2
Bowers' Exploding Array Function/Bird's array notation	{12,2}
Fast-growing hierarchy	f1(71)	f1(72)
Hardy hierarchy	Hω(72)	Hω(73)
Middle-growing hierarchy	m(ω,7)	m(ω,8)
Hyper-E notation	E2.1614
Hyper-E notation (non-10 base)	\(E[12]2\)
Hyperfactorial array notation	5!	6!
X-Sequence Hyper-Exponential Notation	12{1}2
Steinhaus-Moser Notation	3[3]	4[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(-0.3)	H(-0.2)
Bashicu matrix system with respect to version 4	(0)[12]	(0)[13]
m(n) map	m(1)(3)	m(1)(4)
s(n) map	\(s(1)(\lambda x . x+1)(71)\)	\(s(1)(\lambda x . x+1)(72)\)