Multiple choice

Find the wrong number in the following number series. $17, 103, 523, 2119, 6423, 12967$

  1. $6423$
  2. $103$
  3. $2119$
  4. $17$
  5. $12967$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is: n³ + n, where n starts at 2. 2³+2=10, 3³+3=30, 4³+4=68, 5³+5=130, 6³+6=222. The given numbers don't match. Alternative: previous ×5+15, ×4+31, ×3+478 doesn't work. The actual pattern appears to be based on cube of consecutive numbers plus an increment. 6423 should be 17³+10=4923 or 18³+27=5859. 6423 doesn't fit the cube pattern (around 17-18³ range but offset incorrect).

Keep practicing — related questions