Integer Array With Avoidance

Consider a 100×100 100 \times 100 table, filled with integer entries from 1 to NN inclusive. The entry in the iith row and jjth column is denoted by ai,j a_{i,j} . For all integers ii and jj such that i+j100 i + j \leq 100 , the integer ai,j a_{i,j} does not appear in the (i+j)(i+j)th row. What is the minimum value of NN?

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