A way to write a number in various bases is: 1012, 3Fa16, 51910.
The thing here, is that we apparently specify the base in decimal by default. This makes sense in everyday life, since we're not really doing base conversion when grocery shopping. But
10 is ambiguous when working with different bases. So why is 10110 not binary or ternary or octal when working specifically with base conversion?
How about 101102? Is 1111113 = 18310 = 183?