BRENTFACTORS[4261]:=[ ,,,,,,,,,,,, [ 286791568519 ],,,,,, 
  [ 1925861281, 851540268654962517675689621 ],,,, [ 869809022604514320572617 ]
   ,,,,,, [ 4169979099113, 65125211193992231 ],,,,,,,, [ 7798840443059 ],,,,,,
  ,,,,,,,,,, [ 105111588274525571, 1109504701853155730641 ],,,,,, 
  [ 6956891864053982614035043, 13186733432782475201717706473027, 
      4509963334517670281520497734670441 ],, 
  [ 1769609879, 14843392301, 1371434861677, 1411182220849 ],,,,,,,,,, 
  [ 8299599598007, 12277281711182623 ],, [ 14847417329774130487 ],,,,,,,,,, 
  [ 30790545691 ],,,,,,,,,,,,,, [ 97715940556712908861 ],,,,,,,,,,,,,,,,,,,,,,
  ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, [ 12971076869 ],,,,,,,,,,,,,,,,,,,,,,
  ,,,,,,,,,,,,,,,,,,,, [ 17915160912191483 ] ];
