On the number of solutions of the generalized Ramanujan-Nagell equation $x²-D=2^{n+2}$

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1. Ivan Korec, Structures related to Pascal’s triangle modulo $2$ and their elementary theories
2. Maohua Le, On the diophantine equation $D₁x²+D₂=2^{n+2}$
3. Maohua Le, A note on the number of solutions of the generalized Ramanujan-Nagell equation $x²-D=k^n$