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a1 = 3*1 + 1 = 4
a2= 3*2 + 1= 7
r=3
a60= 3*60+1=181
S60= (4+181)*60 / 2 = 5550
bn=4n-1
b1=3
b2=7
b3=11
r=4
b60=239
s60= (3+239)*60 / 2 = 7260