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12+52=64
14+50=64 itd...
w końcu zostaję:
10×64+32=640+32=672
r=2
a1=12
an=a1+(n-1)*r
an=12+(n-1)*2
an=12+2n-2
an=2n+10
a4=2*4+10=18
a5=2*5+10=20..