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A336827
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a(n) is the largest integer that can be written in two bases smaller than n as mutually-reversed strings of digit(s), for n>=4.
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1
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OFFSET
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4,2
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LINKS
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EXAMPLE
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a(5) is 22 because 22 = 211 (base 3) = 112 (base 4) is the largest such integer with both bases < 5 (here 3 and 4).
a(6) is also 22 because there are no larger such integers with both bases < 6.
a(7) is 9831 because 9831 = 303311 (base 5) and 113303 (base 6) is the largest such integer with both bases < 7 (here 5 and 6).
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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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