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262 octal is178 decimal.262 decimal is406 octal
Hex 254 = 1124 octal
Decimal 18 = 22 octal
octal was invented in china in 1256
Octal and hexadecimal numbers are useful for humans as they compactly represent binary numbers:each octal digit represents exactly 3 binary digitseach hexadecimal number represents exactly 4 binary digitsFor example, instead of trying to read (and remember) the binary number 100111001001 it can be represented as hexadecimal 0x09c9 or octal 04711 which are easier to read (and remember) for humans.