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 A282039 Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are < p/2. 5
 3, 33, 60, 138, 315, 390, 663, 1008, 1425, 1743, 2280, 2475, 3108, 3570, 4323, 4590, 6045, 8055, 8418, 9168, 11610, 12045, 13398, 14340, 14823, 15813, 22425, 23028, 24885, 26163, 32310, 33033, 34503, 35250, 42333, 43995, 46548, 49173, 51870, 52785, 58443, 60393, 61380, 66435, 67470, 70623 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Aebi, Christian, and Grant Cairns. Sums of Quadratic residues and nonresidues, arXiv preprint arXiv:1512.00896 (2015). MAPLE with(numtheory): Ql:=[]; Qu:=[]; Q:=[]; Nl:=[]; Nu:=[]; N:=[]; for i1 from 1 to 300 do p:=ithprime(i1); if (p mod 8) = 7 then ql:=0; qu:=0; q:=0; nl:=0; nu:=0; n:=0; for j from 1 to p-1 do if legendre(j, p)=1 then   q:=q+j;   if j

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Last modified August 7 23:53 EDT 2020. Contains 336280 sequences. (Running on oeis4.)