A043659 Numbers n such that base 13 representation has exactly 4 runs.

2210, 2212, 2213, 2214, 2215, 2216, 2217, 2218, 2219, 2220, 2221, 2222, 2223, 2224, 2226, 2227, 2228, 2229, 2230, 2231, 2232, 2233, 2234, 2235, 2236, 2237, 2238, 2240, 2241, 2242, 2243, 2244, 2245, 2246, 2247, 2248