What group of letters comes next from the series?

Question

What comes next in the series?

J, KK, LLL, MZ, A, BO, CPP, ?

Hint: Um9tYW4gTnVtZXJhbHM=

Answer 1

J ----- (J - 1) ====> I
KK ------- (K - 2)(K - 2) ====> II
LLL ------- (L - 3)(L - 3)(L - 3) ====> III
MZ -------- (M - 4)(Z - 4) ====> IV
A ----- (A - 5) ====> V
BO ------- (B - 6)(O - 6) ====> VI
CPP -------- (C - 7)(P - 7)(P - 7) ====> VII
Now next number in the Roman numeral is VIII ==> DQQQ

Comments

You forgot to decipher the Base64 hint.