Cifry, cifry, cifričky ...
Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 2, pp. 49-51.

Voir la notice de l'article dans Czech Digital Mathematics Library

The article presents seven mathematical problems concerning divisibility and their solutions. The problems are of various difficulty and are aimed mainly at lower secondary school pupils. 
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     author = {Jedin\'ak, Du\v{s}an},
     title = {Cifry, cifry, cifri\v{c}ky ...},
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Jedinák, Dušan. Cifry, cifry, cifričky .... Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 2, pp. 49-51. https://geodesic-test.mathdoc.fr/item/RMF_2009__84_2_a9/