242 (number)

← 241 242 243 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-two
Ordinal	242nd; (two hundred forty-second)
Factorization	2 × 112
Greek numeral	ΣΜΒ´
Roman numeral	CCXLII
Binary	111100102
Ternary	222223
Senary	10426
Octal	3628
Duodecimal	18212
Hexadecimal	F216

Last updated June 10, 2024

242 (two hundred [and] forty-two) is the natural number following 241 and preceding 243.

242 is the smallest integer to start a run of four consecutive integers with the same number of divisors.^[1]^[2]

242 is a nontotient since there is no integer with 242 coprimes below it.

242 is a palindrome.

242 is the number of parallelogram polyominoes with 8 cells.^[3]

242 is the difference between 355 and 113, two numbers used in an approximation of pi,

${\frac {355}{113}}=3.14159292035\ldots$

(This fraction is slightly larger than $\pi$ , by a factor of around $0.000000266764\dots$ )

242 is the sum of elements in a 5-orthoplex: 32 polychora, 80 cells, 80 faces, 40 edges, and 10 vertices.

Related Research Articles

2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and only even prime number.

20 is the natural number following 19 and preceding 21.

22 (twenty-two) is the natural number following 21 and preceding 23.

23 (twenty-three) is the natural number following 22 and preceding 24.

46 (forty-six) is the natural number following 45 and preceding 47.

105 is the natural number following 104 and preceding 106.

113 is the natural number following 112 and preceding 114.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

300 is the natural number following 299 and preceding 301.

500 is the natural number following 499 and preceding 501.

6000 is the natural number following 5999 and preceding 6001.

163 is the natural number following 162 and preceding 164.

1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.

216 is the natural number following 215 and preceding 217. It is a cube, and is often called Plato's number, although it is not certain that this is the number intended by Plato.

10,000,000 is the natural number following 9,999,999 and preceding 10,000,001.

100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.

240 is the natural number following 239 and preceding 241.

5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number.

30,000 is the natural number that comes after 29,999 and before 30,001.

80,000 is the natural number after 79,999 and before 80,001.

References

↑ R. K. Guy Unsolved Problems in Number Theory, section B18.
↑ D. Wells, The Penguin Dictionary of Curious and Interesting Numbers, Penguin Books, NY, 1986: 147, 176.
↑ Sloane, N. J. A. (ed.). "SequenceA006958(Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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[1] R. K. Guy Unsolved Problems in Number Theory, section B18.

[2] D. Wells, The Penguin Dictionary of Curious and Interesting Numbers, Penguin Books, NY, 1986: 147, 176.

[3] Sloane, N. J. A. (ed.). "SequenceA006958(Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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