SOLUTION: if the sequences starts out 1, 4, 8, 13, 19 what is the 450th number in the sequence I know that from the first to the second number is 3 then four to eight is four and it increase

SOLUTION: if the sequences starts out 1, 4, 8, 13, 19 what is the 450th number in the sequence I know that from the first to the second number is 3 then four to eight is four and it increase

Algebra.Com

Question 292465: if the sequences starts out 1, 4, 8, 13, 19 what is the 450th number in the sequence I know that from the first to the second number is 3 then four to eight is four and it increases by one more every number but dont know how to find the 450th number
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a=1/2(n^2+3*n-2)
a= 1/2*(450^2+3*450-2)
a = 101924
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