What makes a number a routing number? Does it fit the model equation -

        3 (d_1 + d_4 + d_7) + 7 (d_2 + d_5 + d_8) + (d_3 + d_6 + d_9) mod 10 = 0  (answer of the digits divided by 10 gives no remainder and divides evenly by 10)

All routing numbers must be divisible by 10

Example  -
Routing: 026318252
3 (0 + 3 + 2) + 7 (2 + 1 + 5) + (6 + 8 + 9) = 94
94 mod 10 does not equal 0

This means it's an invalid routing number and would give this error if entered into The Financial Edge.