Question

1,2,4,7,11 rule, next three numbers

Answer 1

1+1=2
2+2+4
4+3=7
7+4=11
11+5=16
16+6=22
22+7=29

Answer 2

but it needs a rule, so what would the rule be?

Answer 3

f_n=f_(n-1)+n
where f_1=2 and
f_2=f_(2-1)+2=f_(1)+2=2+2=4
f_3=f_(3-1)+3=f_(2)+3=4+3=7
ok so
f_n=f_(n-1)+n is a recursive pattern

Answer 4

for n>=2

Answer 5

and n is an integer

Answer 6

none of this seems right to me, can you put it into y's and x's?

Answer 7

1/2(n^2-n+2)
n are natural numbers

Answer 8

la-mrc that also looks good