Because 5 is divided by 13 remainder 5, 55 by 13 remainder 3, 555 by 13 remainder 9, 5555 by 13 remainder 4, 5555 by 13 remainder 6, 5555 by/kloc-0. That is, every 6-bit period, when 200 1 is divided by 6, the remainder is 3 and the third remainder is 9.

2、 1. 1+3.3+5.5+7.7+9.9+ 1 1. 1 1+ 13. 13+ 15. 15+ 17. 17+ 19. 19

= 1. 1+9.9+3.3+7.7+5.5+ 1 1. 1 1+ 19. 19+ 13. 13+ 17. 17+ 15. 15

= 1 1+ 1 1+5.5+30.3+30.3+ 15. 15

= 103.25