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de cate ori apare cifra 2 de la 1 la 260

Răspuns :

2,20,21,22,23,24,25,26,27,28,29,32,42,52,62,72,82,92,102,129,121,122,123,124,125,126,127,128,129,132,142,152.
Sunt 32 de numere