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Triangle read by rows: n-th row gives the indices of the n repunits that divide A340549(n).
Up to row 18, there are n terms in the n-th row.
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The 5th row is {1, 2, 3, 4, 6} since A340549(5) = 11222211 is the least integer that is divisible by five repunits and these ones are R_1, R_2, R_3, R_4 and R_6.
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