Starting with polynomial:
P : t
Extension levels are: 1 4 8
-------------------------------------------------
Trying to find an order 4 Kronrod extension for:
P1 : t
Solvable: 1
-------------------------------------------------
Trying to find an order 8 Kronrod extension for:
P2 : t^5 - 10*t^3 + 15*t
Solvable: 1
-------------------------------------------------
Ending with final polynomial:
P : t^13 - 170/3*t^11 + 3251/3*t^9 - 8652*t^7 + 29631*t^5 - 41790*t^3 + 19215*t
-------------------------------------------------
Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
-------------------------------------------------
The nodes are:
| (5.1842688974446196437 + 1.0453204234503067341e-166j)  +/-  (2.39e-61, 2.39e-61j)
| (3.9309600114055574643 - 3.1266871981530087357e-166j)  +/-  (5.97e-61, 5.97e-61j)
| (0.9467370109606977334 + 2.3741624826653354468e-166j)  +/-  (2.7e-62, 2.7e-62j)
| (2.8569700138728056542 - 2.7133285516175262249e-166j)  +/-  (4.6e-61, 4.6e-61j)
| (1.8550647122034955328 - 1.0174982068565723343e-166j)  +/-  (2.61e-61, 2.61e-61j)
| (1.3556261799742658658 + 1.1923807111600457043e-168j)  +/-  (1.15e-61, 1.15e-61j)
| (-1.8550647122034955328 + 1.212952383585658472e-173j)  +/-  (2.02e-61, 2.02e-61j)
| (-3.9309600114055574643 + 1.8386229439566681806e-185j)  +/-  (5.61e-61, 5.61e-61j)
| (-5.1842688974446196437 + 1.8235853783749913291e-190j)  +/-  (2.39e-61, 2.39e-61j)
| (-1.3556261799742658658 - 4.4521127401733186745e-194j)  +/-  (1.43e-61, 1.43e-61j)
| (-0.9467370109606977334 - 1.633025220787825465e-201j)  +/-  (2.28e-62, 2.28e-62j)
| (3.1147484222179898548e-207 - 9.3442452666539695645e-207j)  +/-  (1.28e-205, 1.28e-205j)
| (-2.8569700138728056542 + 3.6260443998244472952e-217j)  +/-  (3.95e-61, 3.95e-61j)
-------------------------------------------------
The weights are:
| (8.2874382702028428451e-07 - 1.2226376041774920975e-171j)  +/-  (8.78e-24, 1.38e-54j)
| (0.00020005768650733837153 + 3.1606160793661847875e-169j)  +/-  (1.81e-22, 2.84e-53j)
| (0.2518727447625320007 + 9.4004680844615661017e-167j)  +/-  (2.02e-19, 3.17e-50j)
| (0.0069101518110872609821 + 3.4236971855439041432e-168j)  +/-  (2.55e-21, 4e-52j)
| (0.071454465120006718056 + 2.5860150387831199519e-167j)  +/-  (4.23e-20, 6.63e-51j)
| (-0.016959195300645219993 - 1.5199408036670025403e-166j)  +/-  (1.56e-19, 2.44e-50j)
| (0.071454465120006718056 - 8.1092340004132312362e-168j)  +/-  (9.48e-22, 1.48e-52j)
| (0.00020005768650733837153 - 2.9522533272521306129e-170j)  +/-  (3.18e-25, 4.99e-56j)
| (8.2874382702028428451e-07 + 8.3187299109882377938e-172j)  +/-  (1.12e-26, 1.79e-57j)
| (-0.016959195300645219993 + 3.0288202675311835209e-167j)  +/-  (2.38e-22, 4.06e-53j)
| (0.2518727447625320007 - 3.6697660304841898316e-167j)  +/-  (2.84e-22, 5.28e-53j)
| (0.37304189435336976321 + 4.2465809146286710373e-167j)  +/-  (1.17e-22, 2.96e-53j)
| (0.0069101518110872609821 + 4.7228612231505481507e-169j)  +/-  (2.91e-24, 4.34e-55j)
