Information about Fibonacci numbers
Faibonacci discovered when observing rabits that they multiplied 1,2,3,5, he noticed that there was a pattern to the numbering if you add the two proceeding numbers you will come up with the next number that you need. Example 1 + 2 = 3, 2 + 3 = 5, the next in line would be 3 + 5 = 8 and so on.
In the same mannor you can figure out this problem.
10, _____, 24, _____, _______, 100, _____, ______, 686
10 + _____ = 24, which is 14
14 +24 = 38
24 + 38 = 62
38 + 62 = 100
62 + 100 = 162
100 + 162 = 262
162 + 262 = 424
262 + 424 = 686
There isn't much to it. If the first number is blank and you need to figure it out you can always use the X, 2X, 3X, etc thing.
If you know the first number and don't the other numbers, suppose the first number is 4 you use:
4, x + 4, X + 4 + 4 or X + 8, X +4 + X + X + 4 or 3X + 8, etc. until you get to a number.