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Möbius Inversion Formula

Question 1 of 14

What is the Möbius function?

  1. A function that takes a positive integer as input and returns 1 if the integer is square-free, -1 if the integer has an even number of prime factors, and 0 otherwise.
  2. A function that takes a positive integer as input and returns the number of prime factors of the integer.
  3. A function that takes a positive integer as input and returns the sum of the digits of the integer.
  4. A function that takes a positive integer as input and returns the greatest common divisor of the integer and 10.

Prize Money

15₹7 Crores
14₹1 Crore
13₹50,00,000
12₹25,00,000
11₹12,50,000
10₹6,40,000
9₹3,20,000
8₹1,60,000
7₹80,000
6₹40,000
5₹20,000
4₹10,000
3₹5,000
2₹2,000
1₹1,000