CAT: Number SystemFactorisation. Free, no login required.

Q1:

2025 Slot 2

Factorisation

Hard

The number of divisors of (26×35×53×72)(2^6 \times 3^5 \times 5^3 \times 7^2), which are of the form (3r+1)(3r+1), where rr is a non-negative integer, is

Answer options
Option 1
Correct Answer
Explanation for 2025 Slot 2 QA question 1

Q2:

2025 Slot 1

Factorisation

Medium

In a 3-digit number N, the digits are non-zero and distinct such that none of the digits is a perfect square, and only one of the digits is a prime number. Then, the number of factors of the minimum possible value of N is

Q3:

CAT 2024 Slot 2

Factorisation

Medium

If mm and nn are natural numbers such that n>1n > 1, and mn=225×340m^{n}=2^{25} \times 3^{40}, then m−nm-n equals

Answer options
Option 2
Correct Answer
Explanation for CAT 2024 Slot 2 QA question 3

Q4:

CAT 2023 Slot 3

Factorisation

Medium

The sum of the first two natural numbers, each having 1515 factors (including 11 and the number itself), is

Q5:

CAT 2023 Slot 2

Factorisation

Medium

The number of positive integers less than 5050, having exactly two distinct factors other than 11 and itself, is

Q6:

CAT 2023 Slot 1

Factorisation

Medium

Let nn be the least positive integer such that 168 is a factor of 1134n1134^n. If m is the least positive integer such that 1134n1134^{n}. is a factor of 168m168^m, then m+nm + n equals

Answer options
Option 3
Correct Answer
Explanation for CAT 2023 Slot 1 QA question 6

Q7:

CAT 2020 Slot 3

Factorisation

Medium

How many pairs (a,b)(a, b) of positive integers are there such that a≤ba \le b and ab=ab = 420174^{2017}?

Answer options
Option 3
Correct Answer
Explanation for CAT 2020 Slot 3 QA question 7

Q8:

CAT 2019 Slot 2

Factorisation

Easy

How many factors of 24×35×1042^4 \times 3^5 \times 10^4 are perfect squares which are greater than 1?1?

Q9:

CAT 2018 Slot 2

Factorisation

Medium

If NN and xx are positive integers such that NN=2160N^{N}=2^{160} and N2+2NN^{2}+2 ^N is an integral multiple of 2x2^x, then the largest possible xx is

Q10:

CAT 2017 Slot 2

Factorisation

Easy

If the product of three consecutive positive integers is 1560015600 then the sum of the squares of these integers is

Answer options
Option 4
Correct Answer
Explanation for CAT 2017 Slot 2 QA question 10