Given n (always odd), return output a that has concentric rings of the 69s and 0s around the center point. Examples:
Input n = 3
Output a is [ 69 69 69
69 0 69
69 69 69 ] Input n = 5
Output a is [ 0 0 0 0 0
0 69 69 69 0
0 69 0 69 0
0 69 69 69 0
0 0 0 0 0]
Find the numeric mean of the prime numbers in a matrix.
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Solution 662218
despites its pass,my sol still wrong when it be the case:"n=7",because the central element always zero no matter how we change input "n",