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A115531
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Numbers n such that the concatenation of n with 3*n gives a square.
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816326530612244897959183673469388, 1836734693877551020408163265306123, 3265306122448979591836734693877552, 3746097814776274713839750260145681581685744016649323621228
(list; graph; refs; listen; history; internal format)
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