8
3 5
2 1 4
Place unique positive integers into a pyramid such that each number equals the sum of the two numbers below it. Minimize the top number. A solution for three rows is above. Solve for 4, 5, and 6 rows. (or more...). To remove reflections in submissions, let the lower left corner be less than the lower right.
Source: Original. Based on what ought to be a classic puzzle I found in the recent Games Magazine, with 6 rows and the top number of 100.
98
46 52
26 20 32
17 9 11 21
12 5 4 7 14
10 2 3 1 6 8
43
20 23
12 8 15
9 3 5 10
7 2 1 4 6
The two solutions for a 4-pyramid of 20 can be seen embedded in the above
solutions.