242 (number)
242 (two hundred [and] forty-two) is the natural number following 241 and preceding 243.
| ||||
|---|---|---|---|---|
| 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 | |||
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.
- Sloane, N. J. A. (ed.). "Sequence A006958 (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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