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A034991
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Smallest square starting with a string of n 'digit_7's.
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1
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729, 7744, 777924, 77774761, 77777400996, 777777594889, 77777777127241, 77777777127241, 7777777771566496516, 7777777777144230025, 777777777770200337601, 777777777777430543201344, 77777777777778331004281924, 77777777777777489970787004164, 7777777777777771308012741325056, 777777777777777744351960257494201, 7777777777777777716034080781138596
(list; graph; refs; listen; history; internal format)
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