5 6 11 66 9 7 16............

Keep practicing — related questions

• 97 86 75 64..................
• 6 10 18 34...........
• 10,21,34,.........,70,93
• 2 4 10 24 54 .............
• 2 4 10 24 54 .............
• 3 8 15 24 35 48 63 80..........
• 129 65 33 17 9............
• 77 68 57 50 37.................