407=axn3+bxn2+axn+b
factorizando
407=an(n2+1)+b(n2+1)
407=(an+b)(n2+1)
por tanteo
n=6
a=1
b=5
la suma de a+b+n
1+5+6=12
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407=axn3+bxn2+axn+b
factorizando
407=an(n2+1)+b(n2+1)
407=(an+b)(n2+1)
por tanteo
n=6
a=1
b=5
la suma de a+b+n
1+5+6=12