a(1)=6 because e.g. x^6+16x+16 have factor x^3-2x^2+4
a(2)=7 because e.g. x^7-183352x+814800 have factor x^3+4x^2+22x-300
a(3)=8 because e.g. x^8+7x-4 have factor x^3-x^2+2x-1
a(4)=9 because e.g. x^9+2187x+2916 have factor x^3+3x^2+9x+9
a(5)=10 because e.g. x^10+297x-243 have factor x^3+3x-3 (*Schinzel*)
a(6)=12 because e.g. x^12+576x+368 have factor x^3+2x^2+4x+2 (*Browkin-Schinzel*)
a(7)=13 because e.g. x^13+768x+1024 have factor x^3+2x^2+4x+4 (*Browkin*)
a(8)=14 because x^14+4x+3 have factor x^3-x^2+1 (*Bremner*)
a(9)=15 because x^15-1059328125x+2378362500 have factor x^3+15x-45 (*Browkin*)
a(10)=16 because x^16+3486328125x+9277343750 have factor x^3+5x^2+25x+50 (*Bremner*)
a(11)=17 because x^17+103x+56 have factor x^3-x^2+x+1 (*Bremner*)
a(12)=22 because x^22+376832x-425984 have factor x^3+ 2 x^2-4 (*Browkin*)
a(13)=24 because x^24+14336x+12032 have factor x^3-2x^2+2 (*Browkin-Schinzel*)
a(14)=52 because x^52+2731599200256x+3539053051904 have factor x^3+2x^2+4x+4 (*Browkin*)
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