Question 980867
The first digit can be 1, 2, or 3,
to make it a 4-digit number, and
to make the fourth digit 9 or less.
{{{first}}}= first digit
{{{fourth=3*first}}}= fourth digit
{{{third}}}= third digit
{{{second}}}= second digit ={{{third}}}


{{{system(second=third,third+fourth=3*second)}}} ---> {{{third+fourth=3*third}}} ---> {{{fourth=2*third}}}


{{{system(fourth=3*first,fourth=2*third)}}} ---> {{{fourth}}} is a multiple of {{{2}}} and a multiple of {{{3}}} ---> {{{fourth=6}}}


{{{system(fourth=3*first,fourth=6)}}} ---> {{{first=2}}}


{{{system(fourth=2*third,fourth=6)}}} ---> {{{third=3}}}


{{{system(second=third,third=3)}}} ---> {{{second=3}}}


The number is {{{highlight(2336)}}} .