1+(1/3)+(1/9)+(1/27)+(1/81)+(1/243).
1+(1/3)+(1/9)+(1/27)+(1/81)+(1/243)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 27</gadget>
<output>1/27 = around 0.037037</output>

<gadget id="calculator">1 / 81</gadget>
<output>1/81 = around 0.012346</output>

<gadget id="calculator">1 / 243</gadget>
<output>1/243 = around 0.004115</output>

<gadget id="calculator">1 + (1/3) + (1/9) + (1/27) + (1/81) + (1/243)</gadget>
<output>364/243 = around 1.497942</output>

<result>364/243 = around 1.497942</result>