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A075024
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a(1) = 1, a(n) = the largest prime divisor of the number C(n) = concatenation of 1,2,3... up to n then reverse up to 1.
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1
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1, 11, 37, 101, 271, 37, 4649, 137, 333667, 12345678910987654321, 17636684157301569664903, 2799473675762179389994681, 2354041513534224607850261, 2068140300159522133, 498056174529497
(list; graph; refs; listen; history; internal format)
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