SOLUTION: I can't understand this sequence an+1= an + 3 a1=1 the result would be 1 4 7 10 but how does it work

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Question 340326: I can't understand this sequence an+1= an + 3 a1=1
the result would be 1 4 7 10 but how does it work
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
a%28n%2B1%29=a%28n%29%2B3
a%281%29=1
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a%281%2B1%29=a%281%29%2B3
a%282%29=a%281%29%2B3=1%2B3=4
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a%283%29=a%282%29%2B3=4%2B3=7
a%284%29=a%283%29%2B3=7%2B3=10
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Each new value builds off of the previous value.