Question 896784
260    279     -47     -751    2106    -3382   3373
539    232     -798    1355    -1276   -9      
771    -566    557     79      -1285   
205    -9      636     -1206   
196    627     -570   
823    57      
880    
The second column is the differences between the terms you submitted
The third  column is the differences between those differences
etc
There is no obvious arithmetic sequence


260 539 771 205 196 823 880
2.07307692 1.43042672 0.26588846 0.95609756 4.19897959 1.06925881 
0.48237477 0.69909209 3.76097561 1.04591837 0.2381531 0.93522727 
the first row is the second divided by the first number etc
the second  row is the first  divided by the second number etc
There is no obvious geometric sequence.