The simplest answer is
t(n) = 36 + 4n for n = 1, 2, 3, ...
42, 44, 45, 46, 48, 49.
They are: 24 28 32 36 40 44 and 48
Add them up. 40, 42, 44, 45, 46, 48, 49, 50
44, 48.
40, 42, 44, 45, 46, 48, 49, 50
40, 42, 44, 45, 46, 48, 49, 50
40, 42, 44, 45, 46, 48, 49, 50.
1st = 12 then 16 20 24 28 32 36 40 44 so 10th = 48
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
40, 42, 44, 45, 46, 48, 49, 50
Add them up. 40, 42, 44, 45, 46, 48, 49, 50
The only number in that list that doesn't divide by 4 is 38.