Rain in the real world and GURPS MAGIC

[Agemegos]

Originally Posted by whswhs

The area of a single hex is 0.87 square yards. I usually take "one hex radius" to mean that single hex plus the hexes adjacent to each of its six sides, which is seven hexes or 6.09 square yards; two hex radius adds 12 more hexes, for 19 hexes or 16.53 square yards; three hex radius adds 18 hexes, for 37 hexes or 32.19 square yards. The formula for radius N is N(N+1)/2 + 1 hexes.

2, 4, 7, 11, 16, 22, 29, …


Try 3N(N+1) + 1