Binary Primes Grace and Helen play a turn-based card game. Each player is given two cards with a zero printed on them, and unlimited cards with a one printed on them. Before the game starts a 1 is placed on the table. Sitting on the same side of the table, a turn then involves placing a card to the left of the table cards, such that the value shown in binary remains prime or one (allowing leading zeros). The winner is the player who is last able to play a card, earning points equal to the value on the table at that time.

https://www.thetimes.co.uk/article/teaser-3167-ljtvbshjk

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