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2014-10-05T13:06:33+03:00

1000 = 23·43+11 ⇒ 1008 =23·43+19

9999=32·312+15 ⇒(9999-x)=32·311+16; 9999-x=9968  (9968=311·32+16)

312·32+16=10000 !