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A290969
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The least positive integer that is a repdigit with length > 2 in exactly n bases.
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1
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OFFSET
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0,2
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COMMENTS
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a(10) <= 1152921504606846975 = 2^60 - 1.
In fact, we have equality in both cases. - Rémy Sigrist, Aug 21 2017
Except for a(5) = (6^12 - 1) / 5, all the numbers in the data through a(8) are Mersenne numbers A000225. - Bernard Schott, Aug 27 2017
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LINKS
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EXAMPLE
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a(1) = 7 = 111_2.
a(2) = 31 = 11111_2 = 111_5.
a(3) = 32767 = (R_15)_2 = 77777_8 = (31,31,31)_32.
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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