K.Ha.Y.'A.Saad. كهيعص

K + Ha + Y + 'A + Saad = 137 + 175 + 343 + 117 + 26 = 798 = 19x42

This is the longest set of initials, consisting of five letters, and it occurs in one sura, Sura 19. The letter “K” (ك = Kaf) in Sura 19 occurs 137 times, “Ha” (ه = Ha) occurs 175 times, “Y” (ي = Ya) occurs 343 times, “ `A” (ع = Ayn) occurs 117 times, and “S” (ص = Saad) occurs 26 times. Thus, the total occurrence of the five letters is 137+175+343+117+26 = 798 = 19x42.