Richelle's square number

Find the smallest positive integer whose product with 116 116 gives a perfect square.

This problem is posed by Richelle C .


The answer is 29.

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8 solutions

Wee Hau Chin
Sep 23, 2013

116 116 can be factorized into 29 × 2 2 29 \times 2^{2} . For a perfect square, it's factors must be able to pair up. Therefore, 29 29 is the minimum number whose product with 116 116 gives a perfect square.

Big Guy
Sep 28, 2013

$$ 116x = y^2 \Rightarrow 2^2 \times 29x = y^2 \Rightarrow 29x = \left(\frac{y}{2} \right)^2 $$

since : $$ 29 \ \textrm{is prime} \ \Rightarrow x= 29 $$

Shubhankar Gupto
Sep 23, 2013

To find the smallest positive integer, we have to find the prime factors of 116. 116=2 2 29. 2 already comes two times. So we should multiply 116 with 29 to make it the square of 58

Anand Raj
Sep 22, 2013

116= 2 x 2 x 29 . So multiplication by 29 makes the product a perfect square

Raja Fakirchandra
Sep 24, 2013

Prime factorisation of 116 = 2 x 2 x 2

Here, pairing of 2 is completed.

So, by multiplying it by 29, it would become the square of

2 x 29 = 58

So, the answer is 29 .

Tristan Shin
Sep 23, 2013

116 = 2 2 × 29 116=2^{2} \times 29 . Therefore, the first perfect square that is divisible by 116 is 2 2 × 2 9 2 2^{2} \times 29^{2} , or 116 × 29 116 \times 29 . The answer is 29.

William Cui
Sep 23, 2013

We know that 116 = 4 29 116=4\cdot29 , or 2 2 29 2^2\cdot29 . We want every prime factor to be represented an even number of times, so we the smallest number is 29. Checking, 2 2 29 29 = 3364 2\cdot2\cdot29\cdot29=3364 , which indeed is a perfect square.

Ankit Salecha
Sep 23, 2013

find the factor of 116 i.e 2 2 29 . So, answer will be 29 because multiply it with 116 give perfect square.

sorry it will be 2 x 2 x 29 not 2229

Ankit Salecha - 7 years, 8 months ago

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