What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: $29, 59, 74, 95, 102, 104$.

Inner transition elements are those elements in which the last electron enters the $f$-orbital. These elements are also known as $f$-block elements,where the $4f$ and $5f$ orbitals are progressively filled.
Lanthanoids range from atomic numbers $58$ to $71$ ($4f$ series).
Actinoids range from atomic numbers $90$ to $103$ ($5f$ series).
Comparing the given atomic numbers:
$29$ is $Cu$ ($d$-block),
$59$ is $Pr$ (Lanthanoid),
$74$ is $W$ ($d$-block),
$95$ is $Am$ (Actinoid),
$102$ is $No$ (Actinoid),
$104$ is $Rf$ ($d$-block).
Therefore,the atomic numbers of the inner transition elements are $59, 95,$ and $102$.