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A308983
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Numbers n such that A308803(2n+1) = (2*10^n-1)(5*10^n+1).
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1
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4, 15, 18, 20, 23, 29, 33, 34, 35, 36, 38, 39, 43, 48, 49, 50, 54, 56, 60, 62, 63, 66, 68, 69, 74, 75, 77, 78, 81, 83, 84, 86, 88, 89
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