Triangular array a(n,k) read by rows: nextprime(k*n!)-k*n!. For 1<=k<=n. 1, 1, 1, 1, 1, 1, 5, 5, 1, 1, 7, 1, 7, 7, 1, 7, 7, 1, 7, 7, 7, 11, 11, 1, 1, 19, 1, 1, 23, 11, 17
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