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A074843
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Quadruplets: base 10 representation is the juxtaposition of four identical strings.
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1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 10101010, 11111111, 12121212, 13131313, 14141414, 15151515, 16161616, 17171717, 18181818, 19191919, 20202020, 21212121, 22222222, 23232323, 24242424, 25252525
(list; graph; refs; listen; history; internal format)
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