Basic Mathematics
# Pattern Recognition

What comes next?

What comes next?

$1\rightarrow 5$ $2\rightarrow 9$ $3\rightarrow 13$ $4\rightarrow 17$ $5\rightarrow 21$ $6\rightarrow \hspace{2 mm} ?$

What goes at the question mark?

$1\rightarrow 6$ $2\rightarrow 9$ $3\rightarrow 14$ $4\rightarrow 21$ $5\rightarrow 30$ $6\rightarrow \hspace{2 mm} ?$

What number goes at the question mark?

What comes next?