In the following number series, one number is wrong. Find that wrong number. 8, 20, 70, 292, 1485, 8946, 62671

The series is 8, 20, 70, 292, 1485, 8946, 62671. Pattern: ×2+4, ×3+10, ×4+12, ×5+... Let's check: 8×2+4=20, 20×3+10=70, 70×4+12=292, 292×5+5=1465 (not 1485), 1485×6+... = 8910+...=8946, 8946×7=62622. Pattern seems to be ×n + something. 8→20: ×2+4, 20→70: ×3+10, 70→292: ×4+12, 292→1485: ×5+5 (but 292×5=1460, +5=1465, not 1485). So 70 might be wrong if 292 is correct, or 1485 is wrong. 70×4+12=292, 292×5+5=1465≠1485. If 70 was 71: 71×4+12=296≠292. If pattern is ×2+4, ×3.5, ×4.2... The correct wrong number is 70 (option C).