Răspunsuri

2014-10-04T20:19:10+03:00

c=13(1+13+13² +13³ +...+13^2011)=13[ 61·3 + 13³ ·61·3+......13^2009·61·3] =13·61·3(1+13³+13^6 +.......3^2009) ⇒ c÷61 = 3·13·(1+13³ +.......13^2009)⇒rest=0

1+13+169=183 = 61·3