Two players are playing Not the Same. They alternate turns removing stones from a pile with stones. On the first turn, the first player removes , , or stones. On each subsequent turn, the player removes , , or stones from the pile, but they cannot remove the same number of stones as the previous player removed in the previous turn. If a player cannot go, they forfeit their turn. The player who removes the last stone wins.
For how many positive integer initial pile sizes does the first player have a winning strategy?
Details and Assumption
If a player forfeits their turn, on the next turn the next player can remove 1, 2, or 3 stones.
A player cannot remove more stones than are left in the pile.
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