The second number is the sum of all the digits of the square of the first number. For [23, 7]: 23² = 529 → 5 + 2 + 9 = 16 → 1 + 6 = 7. For [29, ?]: 29² = 841 → 8 + 4 + 1 = 13 → 1 + 3 = 4
104 156 234 ? 526.5 789.75
...24 12 18 ? 157.5 708.75 3,898.125
4, 17, 62, 317, ?, 13267
If 2 4 6 x 14 28 30
Then, x³+ 2 x+1 = ?
1 5 36 343 ? 59049
...4 5 12 39 160 ?
...5 6.5 20 113.5 799 ...
Find the maximum number of trees which can be planted, 25 meters apart, on the two sides of a straight road 2125 meters long
0 2 10 24 68 120
...16 18 14 20 12 ?
...
