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# 281 (number)

 ← 280 281 282 →
Cardinaltwo hundred eighty-one
Ordinal281st
(two hundred eighty-first)
Factorizationprime
Primetwin prime
Greek numeralΣΠΑ´
Roman numeralCCLXXXI
Binary1000110012
Ternary1011023
Quaternary101214
Quinary21115
Senary11456
Octal4318
Duodecimal1B512
The generalized repunit number ${\displaystyle {\frac {281^{p}-1}{280}}}$ is composite for all prime p < 60000.