Is prime or not?

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Predict whether the following number is prime or not : (545^{4}) + (4^{545}) If it is then answer is 0 else 1


The answer is 1.

Ketan Gupta by Ketan Gupta , 23, India

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2 solutions

Because you know the answer is 0 or 1 and you are allotted three tries, you enter "0" on the first try, and it is incorrect. Then, you enter "1", and it is correct, so the answer is 1 \boxed{1}

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what about solving it instead? :D

Sherif Elmaghraby - 7 years, 4 months ago

I guess I'm not the only one. :)

Ahmad Naufal Hakim - 7 years, 1 month ago

Every odd power of 4 will have 4 as the last digit. So Last digit of 4^5045 is 4. Any number having 5 as its last digit raised to any power should have 25 as its last 2 digits

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