Établissement
Lycée Arago (Perpignan)
Année
2017-2018
Etablissement(s) jumelé(s)
Colegiul National B.P. Hasdeu (Buzau, Roumanie)
Résumé
At the beginning you only have an empty blackboard. At each step you can either write twice the number 1 on the blackboard or delete two numbers equal to n already written and replace them by n-1 and n+1.
How many steps at least will be necessary in order to reach the number 2017?
How many steps at least will be necessary in order to reach the number 2017?
Mots clés
Compte-rendu