Английская Википедия:242 (number)
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Шаблон:Refimprove Шаблон:Infobox number 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
- ↑ 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.
- ↑ Шаблон:Cite OEIS