section_heading: Pretvorba sustava
paragraph_text: a<sub>3</sub>a<sub>2</sub>a<sub>1</sub>a<sub>0</sub> = a<sub>3</sub> × 13<sup>3</sup> + a<sub>2</sub> × 13<sup>2</sup> + a<sub>1</sub> × 13<sup>1</sup> + a<sub>0</sub> × 13<sup>0</sup>