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A039938
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Smallest k for which k, 2k, ... nk all contain the digit 7.
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0
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7, 37, 237, 1789, 4357, 14379, 19587, 93957, 189572, 189572, 189597, 189597, 189597, 1234397, 1839597, 1958798, 1983957, 1983957, 1983957, 1983957, 1983957, 1983957, 3978594, 11983957, 19596487, 29195397, 29195397, 29195397
(list; graph; refs; listen; history; internal format)
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