1. 4
2. E
3. 10
4. 6
5. FIVE
6. GANGNAM STYLE
7. BIEBER
8. ANSWER
9. 8
10. PRIME NUMBERS
11. LEAP YEARS
12. BACKWARDS
13. 5
14. 500500
15. LYING
16. MINE
17. ENCIRCLE
18: pi decimals
19: 417ff6fbdbcda7c58e682adbcfdad5c4
20: 75
21: apostles
22: the king of pop
23: sunday
24: correct hypothesis
25: 25892
26: 20736
27: insanity
28: controversial
29: four dimensions
30: kilowatt
31: 36