If 1#2=1+11=12, 2#3=2+22+222=246, 3#4=3+33+333+3333=3702. Find 4#5=how much.
如果1#2=1+11=12，2#3=2+22+222=246，3#4=3+33+333+3333=3702．求4#5=多少．
<gadget id="calculator">4 + 44 + 444 + 4_444 + 44_444</gadget>
<output>49_380</output>

<result>49_380</result>