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A034980
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a(n)^2 is smallest positive square starting with a string of n 2's.
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2
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1, 5, 15, 149, 4714, 47141, 471405, 1490712, 1490712, 471404521, 1490711985, 1490711985, 1490711985, 1490711985, 47140452079103, 149071198499986, 149071198499986, 14907119849998598, 14907119849998598, 471404520791031683, 14907119849998597976, 471404520791031682934, 4714045207910316829339
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