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What comes next?
1→5 1\rightarrow 5 1→5 2→9 2\rightarrow 9 2→9 3→13 3\rightarrow 13 3→13 4→17 4\rightarrow 17 4→17 5→21 5\rightarrow 21 5→21 6→? 6\rightarrow \hspace{2 mm} ? 6→?
What goes at the question mark?
1→6 1\rightarrow 6 1→6 2→9 2\rightarrow 9 2→9 3→143\rightarrow 14 3→14 4→214\rightarrow 21 4→21 5→305\rightarrow 30 5→30 6→?6\rightarrow \hspace{2 mm} ? 6→?
What number goes at the question mark?
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