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2014-11-12T19:11:22+02:00
N=29c+r    r= 2c < 29      c ≤ 14    n=29c + 2c = 31c   c = nr.par ⇒c∈{2,4,6,8,10,12,14}
n ∈ { 62,124,186,248, 372, 496}
6 4 6