I thinking of a number!

[Masterkova]

54?

 

[Duckster]

 

[alex2363]

Nope.
Guesses so far:
1, 3.14, 37, 39

15

 

[maxman]

Nope.
Guesses so far:
1, 3.14, 5, 15, 37, 39, 54

 

[GoldenBacon]

Nope.
Guesses so far:
1, 3.14, 5, 15, 37, 39, 54

9?

 

[maxman]

Nope.
Guesses so far:
1, 3.14, 5, 9, 15, 37, 39, 54​

 

[plpenn]

75

 

[maxman]

Nope.
Guesses so far:
1, 3.14, 5, 9, 15, 37, 39, 54, 75​

 

[plpenn]

30

 

[maxman]

Nope.
Guesses so far:
1, 3.14, 5, 9, 15, 30, 37, 39, 54, 75​