Find the wrong term in the following number series- 171 227 291 360 443 531

The pattern is: for each term with digits ab (at index n), next term = a×n + b×n + (n+1). Checking: 171 (n=1) gives 1×1+7×1+2=10, so 171+10=181 (not 227). The actual pattern uses 2-index: 171→227 (1×2+7×2+3=24, 171+56=195, doesn't work). The correct pattern is: split digits, multiply by position, add increment. From 171: 1×1+7×1+2=10, 171+56=227. 227: 2×2+2×2+3=11, 227+64=291. 291: 2×3+9×3+4=37, 291+69=360 (should be 360). 360: 3×4+6×4+5=41, 360+83=443. 443: 4×5+3×5+6=41, 443+88=531. Term 360 breaks the pattern.