. Viết tiếp 2 số hạng vào dãy số sau
10,13,18,26,....,... 0,1.2.4,7,12,....,..... 0,1,4,9,18,....,..... 5,6,8,10,.....,....
1,6,54,648,....,.... 1,5,14,33,72,....,.... 2,20,56,110,182,....,.... 1,3,3,9,27,...,....
1,2,3,6,12,24,.....,..... 1,4,9,16,25,36,...,.... 2,12,30,56,90,...,.... 1,3,9,27,...,....
2,6,12,20,30,...,.... 6,24,60,120,210,...,,.....