242 (number)

Short description: Natural number

| <- 241  | 242 |  243 ->

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← 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
Quaternary| 33024
Quinary| 14325
Senary| 10426
Octal| 3628
Duodecimal| 18212
Hexadecimal| F216
Vigesimal| C220
Base 36| 6Q36

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]

## References

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. "Sequence A006958 (Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused))". OEIS Foundation. https://oeis.org/A006958.

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