Explorar els nombres feliços ens pot servir per practicar els quadrats dels nombres del 0 al 9. Per saber si un nombre és feliç o trist hem de fer els següents càlculs de forma iterativa. *Calcular els quadrats de cada xifra del nombre i sumar-los. Obtenim un nombre nou. * Tornem a fer el mateix càlcul amb el resultat. * Continuem fent el mateix amb cada resultat nou. Hi ha dues possibilitats: *Que arribem a 1 i la sèrie es torni infinitament repetida (1, 1, 1…). El nombre de sortida i tots el que trobem pel camí seran feliços. * Que entrem en un bucle format per vuit nombres: 4-16-37-58-89-145-42-20-4 Aquest projecte és dins dels materials que trobareu a http://ja.cat/matsnap 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