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a2=1
a3=4
a4=7
a5=10
a2= a1+r = -2+3 = 1
a3= a2+r = 1+3=4
a4= a3+r = 4+3=7
a5= a4+r = 7+3=10
Masz tu 5 poczatkowych wyrazow ;)