Starting with polynomial:
P : 8388608*t^23 - 1061158912*t^21 + 55710842880*t^19 - 1587759022080*t^17 + 26991903375360*t^15 - 283414985441280*t^13 + 1842197405368320*t^11 - 7237204092518400*t^9 + 16283709208166400*t^7 - 18997660742860800*t^5 + 9498830371430400*t^3 - 1295295050649600*t
Extension levels are: 23 40
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Trying to find an order 40 Kronrod extension for:
P1 : 8388608*t^23 - 1061158912*t^21 + 55710842880*t^19 - 1587759022080*t^17 + 26991903375360*t^15 - 283414985441280*t^13 + 1842197405368320*t^11 - 7237204092518400*t^9 + 16283709208166400*t^7 - 18997660742860800*t^5 + 9498830371430400*t^3 - 1295295050649600*t
Solvable: 1
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Ending with final polynomial:
P : 8388608*t^63 - 426041370192985570006461204387722007362404352/68193586028690041510290950788710897*t^61 + 4001949969584057058228982858282589809317012045824/1841226822774631120777855671295194219*t^59 - 11248706023987481403072713171116669832298448219537408/23935948696070204570112123726837524847*t^57 + 14137635432146116292384811954374796278901800799398526976/199466239133918371417601031056979373725*t^55 - 1582463621180308896572492738362181480580192816398593163264/199466239133918371417601031056979373725*t^53 + 27312899895141161938583564122235847854025251061487008874496/39893247826783674283520206211395874745*t^51 - 621228041432583040017732979766034167421686690182062884061184/13297749275594558094506735403798624915*t^49 + 757892850877895191414570426641840519653591584228146651430912/295505539457656846544594120084413887*t^47 - 508346644060810806830383484947143620203952484926774511732604928/4432583091864852698168911801266208305*t^45 + 691662586079905743239650064192274430824144833136777200778715136/164169744143142692524774511158007715*t^43 - 37797522437808915411265581484782218415349681517715931005891596288/295505539457656846544594120084413887*t^41 + 951884861522341374593089841016517899907959354066603513304376006656/295505539457656846544594120084413887*t^39 - 510875227903135851768260665560412812353324148568072906291217093632/7577065114298893501143438976523433*t^37 + 8891096216632471472603926969363960020233784806369851989944431988224/7577065114298893501143438976523433*t^35 - 128526001396089597977691936441809999138867697657929322633970566454016/7577065114298893501143438976523433*t^33 + 513158692623611555832134175530481421480765173512018514369505635095680/2525688371432964500381146325507811*t^31 - 563746293785684818600293910725881856270139709411031685501089979227200/280632041270329388931238480611979*t^29 + 13730277068169078172955238469669451141852179119169642565596297713800480/841896123810988166793715441835937*t^27 - 30299470804942978325873455410653394420698662370020910133387847102806000/280632041270329388931238480611979*t^25 + 162147448871432492828730410039292417874079078569180427795332769607966600/280632041270329388931238480611979*t^23 - 693775788811897915125038732903305508642161159330208634364391005148734500/280632041270329388931238480611979*t^21 + 2341086861578570631230446236178928012084052689598052643141943801819651750/280632041270329388931238480611979*t^19 - 6124323394678754124607400231337404265109120953816716349369186448913322375/280632041270329388931238480611979*t^17 + 24307580658897131636795402970939372502316826605495970620429045692800184125/561264082540658777862476961223958*t^15 - 71168844974628612351311108469936831385423971620235521036118637908590116125/1122528165081317555724953922447916*t^13 + 148131162606660819867922704156823534123270007645899012785803446311995784375/2245056330162635111449907844895832*t^11 - 208354537352068978708205876973364687655820538235457879348067394202966241875/4490112660325270222899815689791664*t^9 + 184055051774275561779045286426490164682047939389850504611743521998202288125/8980225320650540445799631379583328*t^7 - 91034982005097905145522440858992727834030191379812125195035188321904053125/17960450641301080891599262759166656*t^5 + 20520763577746853237416445346092614787121339481541213449796871073329984375/35920901282602161783198525518333312*t^3 - 1307886506810393190133249938351352539627413446813812509274544609814596875/71841802565204323566397051036666624*t
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Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 53
Linear system for weights solvable: 0
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 0
  current precision for roots: 212
  current precision for roots: 424
 current precision for weights: 212
Linear system for weights solvable: 0
  current precision for roots: 424
  current precision for roots: 848
 current precision for weights: 424
Linear system for weights solvable: 1
Sufficient bits for target precision reached
Positive weights:   61 out of 63
Indefinite weights: 0 out of 63
Negative weights:   2 out of 63
Extension rule has valid weights: 0
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*** EXTENSION WITH INVALID WEIGHTS ***
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