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A063615
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Exponent of smallest power of 7 having just n 9's in its decimal representation.
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0
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1, 2, 13, 18, 22, 28, 43, 46, 71, 66, 83, 104, 86, 128, 127, 125, 139, 142, 124, 190, 195, 185, 202, 216, 215, 265, 235, 245, 244, 263, 278, 282, 274, 277, 286, 310, 320, 323, 432, 348, 376, 448, 400, 392, 459, 446, 441, 413, 587, 456, 486
(list; graph; refs; listen; history; internal format)
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