推 chuo :19 31 43 55 67 79 91 11/10 23:30
推 RC :4=1 mod3, 3=-1 mod4. n=4+3*-3+12t t屬於Z 11/10 23:32
→ wuwman :m>2,n>3 3n+1=4m+3 -> 3n=4m+2 11/11 00:29
→ wuwman :則4m除以3餘數為1 又因為4除以3餘數為1 11/11 00:31
→ wuwman :所以m除以3餘數也是1 ,so m=4 7 10 13 16 19 22 11/11 00:35
→ wuwman :代回4m+3 可得一樓結果,二樓的我沒能看懂QAQ 11/11 00:37