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 A215696 a(n)=smallest positive k>n+2 such that k*n+1 is a square. 1
 8, 12, 8, 12, 16, 20, 24, 15, 32, 36, 40, 24, 48, 52, 24, 33, 64, 68, 72, 42, 40, 84, 88, 35, 96, 100, 104, 60, 112, 56, 120, 69, 56, 132, 48, 78, 144, 148, 72, 60, 160, 72, 168, 96, 91, 180, 184, 63, 192, 196, 88, 114, 208, 212, 105, 85, 104, 228, 232, 84 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For any n and k=n+2, 1+k*n=(n+1)^2, so here we consider the case k>n+2. Cases k

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Last modified June 4 01:50 EDT 2020. Contains 334809 sequences. (Running on oeis4.)