242 (Number)

From Handwiki
Short description: Natural 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 →
Cardinaltwo hundred forty-two
Ordinal242nd
(two hundred forty-second)
Factorization2 × 112
Greek numeralΣΜΒ´
Roman numeralCCXLII
Binary111100102
Ternary222223
Quaternary33024
Quinary14325
Senary10426
Octal3628
Duodecimal18212
HexadecimalF216
VigesimalC220
Base 366Q36

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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Categories: [Integers]

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