OMM 2016 Problem 4
Decimos que un número entero no-negativo “contiene” a otro número entero no-negativo , si los dígitos de su expansión (o desarrollo) decimal aparecen en forma consecutiva en la expansión (o desarrollo) decimal de . Por ejemplo, 2016 contiene a 2,0,1,6, 20, 16, 201 y 2016. Determina el mayor número entero que no contiene a ningún múltiplo de 7.
Official text Mexican Mathematical Olympiad 2016 official paper, page 1. Quoted with source.
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