Posted by **jill** on Thursday, September 30, 2010 at 8:19am.

describe a pattern in the numbers 4,6,9,13,18

- geometry -
**bobpursley**, Thursday, September 30, 2010 at 9:23am
They are monotonically increasing.

They are increasing a distance of n apart, as in

1st, 2nd, 3rd, 4th, 5th, 6th, ...nth

4, 4+2, 6+3, 9+4, 13+5, 18+6, ...(n-1 term)+n

- geometry -
**Reiny**, Thursday, September 30, 2010 at 10:05am
or

term(1) = 4

term(2) = 6

term(3) = term(1) + term(2) - 1 = 9

term(4) = term(2) + term(3) - 2 = 13

term(5) = term(3) + term(4) - 3 = 18

...

term(n) + term(n-2) + term(n-1) - (n-2)

this is called a recursive formula,

or

term(n) = n(n+1)/2 + 3

Including bobpursley's pattern , there are probably some more

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