Question 318095
<pre><b>

858251         462486         123552        218251

Subtract each of the 2nd, 3rd and 4th terms from its preceding term and
write it between and below the two terms which were subtracted:

858251         462486         123552        218251
       -395767        -338934        94699


Do the same with the bottom row.

858251         462486         123552        218251
       -395767        -338934        94699
                56831         433633
                       376802  


Now repeat the 376802 and place it to the right of 376802

858251         462486         123552        218251
       -395767        -338934         94699
                56831         433633
                       376802        <font color = "red">376802</font>


Now we work backwards.  Add the 376802 to the 433633 getting 810435,
and write that to the right of the 433633

858251         462486         123552        218251
       -395767        -338934         94699
                56831         433633        <font color = "red">810435</font>
                       376802        <font color = "red">376802</font>


Add the 810435 to the 94699 getting 905134,
and write that to the right of the 94699

858251         462486         123552        218251
       -395767        -338934         94699        <font color = "red">905134</font>
                56831         433633        <font color = "red">810435</font>
                       376802        <font color = "red">376802</font>


Add the 905134 to the 218251 getting 1123385,
and write that to the right of the 218251, 

858251         462486         123552        218251        <font color = "red">1123385</font>
       -395767        -338934         94699        <font color = "red">905134</font>
                56831         433633        <font color = "red">810435</font>
                       376802        <font color = "red">376802</font>


So the next number in the series is 1123385

Edwin</pre>