Which number does not belong in the series below?

$2$, $5$, $10$, $17$, $26$, $37$, $50$, $64$

1. $17$
2. $37$
3. $64$
4. $26$

recategorized

Each number having $+3,+5,+7,+11….$ patterns:

• $2+3=5$
• $5+5=10$
• $10+7=17$
• $17+9=26$
• $26+11=37$
• $37+13=50$
• $50+15=65 \textrm{(here 64 is given which is wrong.)}$

Option C is wrong.

by (280 points)