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= (1+2+3+...+2001)((1+2+3+...+2001)²°°°-......)
= 2001/2 x 2002 (1+2+3+...+2001)²°°°-......)
= 2003001 (1+2+3+...+2001)²°°°-......)
= 13 x 154077 (1+2+3+...+2001)²°°°-......)
Jelas bahwa bilangan tersebut adalah kelipatan 13