-1-
-2-
(n-1)2 -(n-2)2 =121
2n-3 =121
n =62
m = 60
P = 132
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n = 62
m = 62 _2 = 60
n -1 = 62 _ 1 = 61
P = 61 + 60 + 11 = 132
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(n-1)²=121+(n-2)²
n²-2n+1=121+n²-4n+4
1-2n=125-4n
2n=124
n=62
P= 11+61+60= 132
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-3-
-4-