[seqfan] 3n-8

Antreas Hatzipolakis anopolis72 at gmail.com
Thu Apr 24 22:34:06 CEST 2014


n separate points are given in the space, for each 3 points we put a yellow
point in the centroid of them! whats the minimum set of yellow points ?

there are exactly 3n-8 points

Reference:
http://www.artofproblemsolving.com/Forum/viewtopic.php?t=586434&p3472866&#p3472866

n= 3,4,5,....
1,4,7,10,13,16....

A016777 : 3n+1, n=1,2,3....

APH



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