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A069018
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Smallest square k>0 such that n*k +1 is also a square or 0 if no such term exists. i.e. when n is a square.
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1
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0, 4, 1, 0, 16, 4, 9, 1, 0, 36, 9, 4, 32400, 16, 1, 0, 64, 16, 1521, 4, 144, 1764, 25, 1, 0, 100, 25, 576, 3312400, 4, 74529, 9, 16, 36, 1, 0, 144, 36, 16, 9, 102400, 4, 281961, 900, 576, 12873744, 49, 1, 0, 196, 49, 8100, 82810000, 4356, 144, 4, 400, 6625476
(list; graph; refs; listen; history; internal format)
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