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A025693
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Index of 2^n within sequence of numbers of form 2^i*7^j.
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1
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1, 2, 3, 5, 7, 9, 12, 15, 18, 22, 26, 30, 35, 40, 45, 51, 57, 64, 71, 78, 86, 94, 102, 111, 120, 129, 139, 149, 159, 170, 181, 193, 205, 217, 230, 243, 256, 270, 284, 298, 313, 328, 343, 359, 375, 392, 409, 426, 444, 462, 480, 499, 518, 537, 557, 577, 597, 618, 639, 661, 683
(list; graph; refs; listen; history; internal format)
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