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Number Bases
How would math be different if humans only had 6 fingers and 8 toes? How does a computer do math if it has no fingers to count on?
There is a number \(a\), which can be written as \(\overline{xyz}\) in base 9 and \(\overline{zyx}\) in base 6, for some positive integer \(x,y,z\). Find \(x+y+z\).
Details and Assumption
\( \overline{xyz} \) represents a 3-digit integer such that it is equal to \(100x+10y+z\) for \(x,y,z\) are non-negative integers and \( 0 \le x,y,z \le 9\).
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by
Kaito Einstein
Find the smallest natural number greater than 3 which has the unit digit of 3 when expressed in base-4, base-5, base-6, base-7, and base-8.
Express your answer in base 10.
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by
Arulx Z
\(N\) is an integer whose representation in base \(b\) is 777. Find the smallest positive integer \(b\) for which \(N\) is the fourth power of an integer.
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by
Anish Harsha
\[(2^3)! = 40320_{10} = 1001\:1101\:1000\:0000_2.\]
The factorial shown above has seven trailing zeros.
How many trailing zeroes does the number \((2^{16})!\) have in binary notation?
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by
Arjen Vreugdenhil
\[1,3,4,9,10,12,13,\ldots\]
The above sequence consists of the powers of \(3\) or the sum of distinct powers of \(3\), arranged in increasing order.
Find the \(100^\text{th}\) term of the sequence.
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by
Kaito Einstein