How Can I: Improve/Condense this CONCATONATE-STYLE formula?

I hope that title is not out of line - I don't know how else to phrase the objective.

Here's what's up:

1. I have a list of cells that contain ID numbers.
2. I need to insert that list into a paragraph with a comma between each.
3. Sometimes there will be blanks in the list

This is the final output:
"Please list the following application numbers on the invoice: 101101, 102102, 103103, 104104, 105105, 106106, 107107, 108108, 109109."

This is the giant formula that I've mustered:

="Please list the following application numbers on the invoice: "&IF(ISBLANK(L40),"",(" "&L40))&IF(ISBLANK(J41),"",(", "&J41))&IF(ISBLANK(J42),"",(", "&J42))&IF(ISBLANK(J43),"",(", "&J43))&IF(ISBLANK(J44),"",(", "&J44))&IF(ISBLANK(J45),"",(", "&J45))&IF(ISBLANK(J46),"",(", "&J46))&IF(ISBLANK(J47),"",(", "&J47))&IF(ISBLANK(J48),"",(", "&J48&"."))

I feel like there's a better way, haha