To rewrite the equation \( 35 = 243 \) as a logarithmic equation, we can express it in the form of \( b^y = x \) which translates to \( \log_b(x) = y \).
In this case:
- The base \( b \) is \( 35 \)
- The result \( x \) is \( 243 \)
- The exponent \( y \) is \( 1 \) (since \( 35^1 = 35 \))
Therefore, the logarithmic form of the equation \( 35 = 243 \) does not quite seem right as there’s no direct logarithmic equation for this form. However, if it is intended to express it as \( 35^y = 243 \) and find \( y \), we express it as:
\[ y = \log_{35}(243) \]
So, to answer the question, the number that Fernando should use as the value in logarithmic terms is \( 243 \).
\[ \text{The value is } 243. \]