Concatenate Formula every Nth Cells

[pyroto]

I've been at this for hours and wondering if anyone could help.
I am trying to do the following:

Cell H4: =CONCATENATE(C4:C7)
Cell H19 = CONCATENATE(C19:C22)
etc.

So every 15 cells in Column H(starting at H4) shows the concatenate of the the 4 cells every 15 cells in Column C


[TABLE="width: 500"]
<tbody>[TR]
[TD][/TD]
[TD]Column C[/TD]
[TD]Column D[/TD]
[TD]Column E[/TD]
[TD]Column F[/TD]
[TD]Column G[/TD]
[TD]Column H[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]Bob[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]BobJerrySusanJordan[/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]Jerry[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD]Susan[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]7[/TD]
[TD]Jordan[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD]Grace[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]9[/TD]
[TD]Justin[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]10[/TD]
[TD]Mathew[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]11[/TD]
[TD]Lily[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]Carmen[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]13[/TD]
[TD]Kim[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]14[/TD]
[TD]Tyson[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]15[/TD]
[TD]Curtis[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]16[/TD]
[TD]Peter[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]17[/TD]
[TD]Jill[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]18[/TD]
[TD]Karen[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]19[/TD]
[TD]Kale[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]KaleHarryJoeBrison[/TD]
[/TR]
[TR]
[TD]20[/TD]
[TD]Harry[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]21[/TD]
[TD]Joe[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]22[/TD]
[TD]Brison[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

 

[footoo]

=if(mod(row(),15)=4,c4&c5&c6&c7,"")

 

[pyroto]

wow. Seems so simple, but yet more than I knew haha. Thank you thank you!

 

[Peter_SSs]

I would alter it a little so that if rows are added deleted above the data, the formulas don't start giving unexpected results.
In H4, copied down
=IF(MOD(ROWS(H$4:H4),15)=1,C4&C5&C6&C7,"")

 

[pyroto]

Thank you so much!! Works like a charm.

 

[Peter_SSs]

Thank you so much!! Works like a charm.

You're welcome.