1. Check if a number belongs to the Fibonacci Sequenc

 n=int(input("Enter the number: "))

c=0

a=1

b=1

if n==0 or n==1:

print("Number belongs to Fibonacci sequence")

else:

while c<n:

c=a+b

b=a

a=c

if c==n:

print("Number belongs to Fibonacci sequence")

else:

print("Number not belongs to Fibonacci sequence")