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A063611
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Smallest power of 7 having just n 5's in its decimal representation.
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0
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1, 7, 15, 27, 21, 49, 55, 47, 51, 87, 85, 107, 75, 99, 61, 149, 138, 133, 171, 135, 165, 237, 209, 197, 269, 221, 232, 219, 277, 248, 258, 306, 271, 264, 357, 296, 310, 347, 354, 260, 342, 374, 407, 425, 362, 457, 485, 480, 486, 488, 492
(list; graph; refs; listen; history; internal format)
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