0
Anonymous
n(n+1)/2 + 3Note that the difference between two consecutive numbers increases by one each time.
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25
Peyton Playz ∙
add 5 each timer
After 13, it's 18.
The next number in the sequence is 18. It's +1, +2, +3, +4, ....
18
Tn = 1 + 3n
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