If by "equal up" you mean add up, there are at least two answers: (3, 7, 13, 31) and (5, 7, 11, 31).
54 and 54
the prime numbers that equal 168 is 2*2*2*3*7 and also Here is a table of all prime numbers up to 1,000:2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997
31 and 2
67 and 5
As a product of its prime factors: 2*3*13 = 78
2 and 3 2x3x3x3= 54
54 and 54
the prime numbers that equal 168 is 2*2*2*3*7 and also Here is a table of all prime numbers up to 1,000:2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997
31 and 2
67 and 5
2 and 17
As a product of its prime factors: 2*3*13 = 78
The two prime numbers that add up to 11 are 2 and 9. However, 9 is not a prime number since it is divisible by 3, so the correct answer is 2 and 9.
Not really. You just have to try different numbers. As to patterns, the probability of finding a prime goes down for higher numbers. The number of prime numbers up to a number "n" is roughly equal to n / ln(n), where ln() is the natural logarithm function.
29
There are 15 prime numbers up to 50.
The two prime numbers that add up to 19 are 7 and 12. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves. In this case, 7 and 12 are not prime numbers, and there are no two prime numbers that add up to 19.