Kurzweg's 3 papers all have confusingly similar names, so I'm going to give them distinct names:
(A-Quick-Way-to-Factor-Large-Semiprimes.pdf) = the 2i paper, the 2(d+n) paper (because that's the value he's searching for, in his terms, Nf(N))
(A-New-Method-for-Factoring-Large-Semiprimes.pdf) = the 2i^2 and 2j^2 paper, because this paper contains a description of an iterative search for the values of 2i^2 and 2j^2 in our terms
(A-New-Approach-to-Factoring-Semiprimes.pdf) = the d, e and f paper, because the variables d, e and f all show up in this paper (I'll show how in a moment).
Next I'm going to outline his paper (the d e and f paper) in terms of our equations. I'm going to use greek letters for his variables that don't exactly map to ours because we've almost taken up the entire alphabet, and he introduces a lot of different variables.
A NEW APPROACH TO FACTORING SEMI-PRIMES:
step 1:
g = sqrt(c)
g is a variable we've defined before, this one includes the decimals
step 2:
α = the closest whole integer to g (d or (d+1))
step 3 - realize that there are two unknown values which add and subtract from α to make a and b:
a = α - β
(where β = x or x+1)
b = α + γ (this isn't a y (why), this is a γ (gamma))
(where γ = (x+2n) or (x+2n-1))
step 4 - which become, if we rearrange:
α * (γ - β) - β*γ = c - α^2
In our terms,
β*γ = x * (x+2n)
or
β*γ = (x+1) * (x+2n-1)
Here's where it gets fascinating:
c - α^2 = e or f
step 5, solve for (β*γ) and (γ - β):
β*γ = δ + ε (where δ and ε are an unknown integers)
γ - β = (c - α^2 + δ + ε)/α
δ < α
step 6, eliminate γ from the equations and set δ=c - α^2 (I'm not sure of the exact path of this mathematical jump so I'll figure it out later if it is important):
β^2 + β*(ε / α) - (δ + ε) = 0
step 7, solve for β:
β = -(ε / (2α)) + sqrt( (ε / (2α))^2 + (δ + ε) )
step 8, since we know ε / (2*α) must be an integer (because it's defining β and a = α - β), we can get to the value that we need to search for to factorize:
let ε / (2*α) = ζ
β = -ζ + sqrt( ζ^2 + 2αζ + δ)
step 9, rearrange for factors:
a = (α + ζ) - sqrt( ζ^2 + 2αζ + δ ) = (α + ζ) - η
b = (α + ζ) + sqrt( ζ^2 + 2αζ + δ ) = (α + ζ) + η
letting η = sqrt( ζ^2 + 2αζ + δ )
step 10:
α and δ are known from c ( δ = c - α^2 and α is the closest integer to g (d or d+1)), so now it just becomes finding a value of ζ that makes η evaluate to a whole integer.
next, Kurzweg solves for ζ and defines the search as between 0 and 1 (decimals), but I don't think that is the right direction to go with this.