In the following number series one number is wrong .Find the wrong no. 25 51 156 794 5574 61339

Pattern: 25 × 2 + 1 = 51, 51 × 3 + 3 = 156, 156 × 4 + 20 = 644 (not 794). The pattern seems to be: multiply by consecutive integers (2, 3, 4, 5...) and add consecutive terms (1, 3, 5, 7...). Checking: 25×2+1=51 ✓, 51×3+3=156 ✓, 156×4+5=629 (not 794). Actually 156 × 5 + 14 = 794, which doesn't fit. Let's try: 25, 25×2+1=51, 51×3+3=156, 156×5+14=794. The number 156 should be different to establish a clear pattern.