my number is exactly the same size

copy the previous number. you may not make it bigger or smaller

10

1+1+1+1+1+1+1+1+1+1

102-1 in base 3

4.5+5.5

1111111111 (base 1)

Σ[n=0->n=∞](9/(10^n))

(sigma(n=1, 10) n/n)

2+2+2+2+2
simple

floor[Integral from x=0->x=2.9 of (x^4-3x^3+x^2+2x+2) dx]