Sum of odd divisors of n < sqrt(n) = sum of even divisors of n < sqrt(n).

Terms

a(0) =1a(1) =40a(2) =100a(3) =208a(4) =928a(5) =1044a(6) =3904a(7) =10692a(8) =17444a(9) =29524a(10) =36652a(11) =45980a(12) =87604a(13) =91044a(14) =136808a(15) =158652a(16) =161564a(17) =171028a(18) =187068a(19) =218652a(20) =230044a(21) =260608a(22) =287868a(23) =406812a(24) =438124a(25) =450492a(26) =583110a(27) =665684a(28) =719550a(29) =731850