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    Home»Bonds»La puce multiplicative, l’énigme maths du « Monde » n °55
    Bonds

    La puce multiplicative, l’énigme maths du « Monde » n °55

    April 26, 2025


    Au mur de la salle de classe, une puce se promène sur l’affiche exposant les tables de multiplication jusqu’à 10. Elle saute de case en case et, en huit bonds, elle parcourt une boucle qui revient à son point de départ, comme indiqué sur la figure. A chaque bond, elle ne se déplace que d’une case à une case voisine (se touchant par un côté ou en diagonale). C’est alors que, observant les nombres de la grille, elle constate qu’elle a fait des bonds dont les écarts sont tous les nombres entiers de 0 à 7 (dans le désordre). Elle a fait un saut de 0 entre les cases 2 et 2, un saut de 1 entre 2 et 3, un saut de 2 entre 2 et 4, un saut de 3 entre 3 et 6, un saut de 4 entre 12 et 16, un saut de 5 entre 9 et 4, un saut de 6 entre 6 et 12 et, enfin, un saut de 7 entre 16 et 9.

    Prise d’ambition, elle se demande si elle peut réaliser une boucle plus longue ayant cette même propriété.

    Sauriez-vous lui indiquer la plus longue boucle qu’elle peut parcourir de sorte que les écarts de ses bonds soient tous les entiers consécutifs de 0 à un certain nombre (mais pas forcément dans l’ordre du parcours) ?

    Il vous reste 4.26% de cet article à lire. La suite est réservée aux abonnés.



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