英文互译镜像站

← 283 284 285 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred eighty-four
Ordinal	284th; (two hundred eighty-fourth)
Factorization	22 × 71
Divisors	1, 2, 4, 71, 142, 284
Greek numeral	ΣΠΔ´
Roman numeral	CCLXXXIV, cclxxxiv
Binary	1000111002
Ternary	1011123
Senary	11526
Octal	4348
Duodecimal	1B812
Hexadecimal	11C16

284 (number)

Last updated April 22, 2025

284 is the natural number following 283 and preceding 285.

In mathematics

284 is an even composite number with 2 distinct prime factors.^[1]
284 is in the first pair of amicable numbers with 220. That means that the sum of the proper divisors are the same between the two numbers.^[2]
284 can be written as a sum of exactly 4 nonzero perfect squares.^[3]
284 is a nontotient number which are numbers where phi(x) equaling that number has no solution.^[4]
284 is a number that is the nth prime plus n. It is the 51st prime number (233) plus 51.^[5]

References

↑ "Composite numbers". mathworld.wolfram.com.
↑ "Amicable numbers". mathworld.wolfram.com.
↑ Sloane, N. J. A. (ed.). "SequenceA004215(Numbers that are the sum of 4 but no fewer nonzero squares)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
↑ Sloane, N. J. A. (ed.). "SequenceA005277". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
↑ Sloane, N. J. A. (ed.). "SequenceA014688". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.

网页镜像工具烟雨镜像程序批量镜像网站镜像站群系统镜像站群系统

[1] "Composite numbers". mathworld.wolfram.com.

[2] "Amicable numbers". mathworld.wolfram.com.

[3] Sloane, N. J. A. (ed.). "SequenceA004215(Numbers that are the sum of 4 but no fewer nonzero squares)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[4] Sloane, N. J. A. (ed.). "SequenceA005277". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[5] Sloane, N. J. A. (ed.). "SequenceA014688". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[1]

[2]

[3]

[4]

[5]