# Star and Numbers logic puzzle

This was on the entrance exam at our local university last year.
I still can't figure out the answer... 61

Because

Each number on the point is the sum of the squares of the numbers connecting to it.

• Any intuition about whether there's a pattern to the inner numbers? – Parthian Shot Mar 7 '16 at 19:25
• I doubt it. If anything, it seems to be made to be easy to figure out. Putting 5 or 6 next to 4 would give 41 or 52, neither of which is obviously a sum of squares. Although four of them being multiples of five might be an intentional red herring. – Lacklub Mar 7 '16 at 19:30
• @ParthianShot: (n+1) goes to n-th unfilled field clockwise – Erbureth says Reinstate Monica Mar 8 '16 at 13:35

$5^2 + 6^2 = 25+36$= $61$
• The way I saw it was noticing that the bigger numbers in the "outer circle" seem to relate to the bigger number in the inner circle. Then I first noticed $5^2 + 1 = 26$, and seeing $4, 3$ and $25$ we have the famous pythagorean triple giving $4^2 + 3^2 = 5^2$ – Improve Mar 7 '16 at 19:19