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0967 - Cifre 8
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== Explicație == a) numerele prime din şirul '''s''' sunt: '''31, 19, 941, 131 şi 223'''. Suma acestora este '''1345'''. b) cifra '''c=9''' apare de '''6''' ori în scrierea numerelor din '''s'''. c) cifrele impare ale unităţilor numerelor din '''s''' sunt, în ordine crescătoare: '''1, 1, 1, 1, 3, 3, 9, 9'''. Se pot forma minimum '''4''' numere cu toate cifrele identice: '''11, 11, 33, 99''', fiecare număr din noul şir având numărul maxim posibil de cifre, adică '''2'''. Numărul minim de termeni ai şirului este egal cu '''4'''.
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