Follows pattern: a_n = floor(1.5 × a_{n-1}) + n. 123×1.5+2=187 (but we have 354). Alternative pattern: 354 = 3×123 - 15, 897 = 3×354 - 165, 1875 = 3×897 - 816. The subtraction grows. Verifying: 10626×1.5+5 = 15944, but we have 16887. The claimed answer 16887 (C) should be verified through the actual pattern.