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We get 2017 - Lycée Arago (Perpignan) Colegiul National B.P. Hasdeu (Buzau, Roumanie)

Titre du sujet: 
We get 2017
Etablissement(s) jumelé(s):
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?
Mots clés:

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Sujet | by Dr. Radut