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A076285
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Numbers of the form (6^{mr}-1)/(6^r-1) for positive integers m, r.
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1
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1, 7, 37, 43, 217, 259, 1297, 1333, 1555, 7777, 9331, 46657, 46873, 47989, 55987, 279937, 335923, 1679617, 1680913, 1727605, 2015539, 10077697, 10124569, 12093235, 60466177, 60473953, 62193781, 72559411, 362797057, 435356467, 2176782337, 2176828993, 2178463249
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