Show life that you have a thousand reasons to smile
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2015= 1024 + 512 + 256 +128 + 64 +16 +8 + 4 + 2 + 1
2015 = 5⁴ + 5⁴ +5⁴ +5³+5¹+5¹+5¹
2015= 625+625+625+125+5+5+5
(nu se poate scrie sub forma de suma de puteri diferite)