Răspuns:
2^n+1=2^n×2
2^n+3=2^n×2^3
3^n+1=3n×3
3^n+2=3^n×3^2
A=2^n×2×3^n+2^n×2^3×3^n×3+2^n×3^n×3^2
A=2^n×3^n(2+2^3×3+3^2)
A=2^n×3^n×35=>35|A