Question 305901
a0=3=3
a1=3+5=8
a2=3+5+5=13
a3=3+5+5+5=18
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a9=3+5+5+5+...+5=48
The sum is then 10*3 plus the sum from 1-9 multiplied by 5. 
{{{S=10*3+(9(9+1)/2)*5}}}
{{{S=30+225}}}
{{{S=255}}}