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A065992
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Numbers k such that the sum of the nonsquare numbers from 1 to k is a square.
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0
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6, 12, 31, 40, 411, 1638, 2352, 9465, 263284, 647498, 1227466, 3179974, 4027111, 5382959, 29444851, 32585267, 50402546, 52610042, 98185445, 3750320631, 14471636075, 79389982446, 157183654414
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