[Community Puzzle] Sum of Spiral's diagonals

Hi to all :slight_smile: ! I agree with @5DN1L : thatโ€™s not an error :
โ†’ your task is not to add twice a value in the square, nor in the diagonals :wink: โ€ฆ

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+Please, donโ€™t forget : have :sun_with_face: sun, :dark_sunglasses: fun and codingames :wink: !

Typos, itโ€™s 8n - 15, 12n - 35 and 13n - 42 (the rest of the computation is good so I guess you had it right on your side but wrong when writing your comment)

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