Fun math problems for today
 

Here are a few "fun" math problems for today. Answers are due by 23:59 (11:59 PM) local time on April 1, 2015.

1. What is the largest prime number less than 20150401?
2. What is the largest twin prime pair less than 41414?
3. What is the largest twin prime pair less than 3434343434?
4. What is the largest twin prime pair less than 3434343434343434343434343434343434343?

[QUOTE=cuBerBruce;399091]Here are a few "fun" math problems for today. Answers are due by 23:59 (11:59 PM) local time on April 1, 2015.

1. What is the largest prime number less than 20150401?
2. What is the largest twin prime pair less than 41414?
3. What is the largest twin prime pair less than 3434343434?
4. What is the largest twin prime pair less than 3434343434343434343434343434343434343?[/QUOTE]

Arithmetic is not math. These are not "math" problems.

[QUOTE=cuBerBruce;399091]Here are a few "fun" math problems for today. Answers are due by 23:59 (11:59 PM) local time on April 1, 2015.

1. What is the largest prime number less than 20150401?
2. What is the largest twin prime pair less than 41414?
3. What is the largest twin prime pair less than 3434343434?
4. What is the largest twin prime pair less than 3434343434343434343434343434343434343?[/QUOTE]

[SPOILER]using pari:
1)20150399
2)41411 and 41413
3)3434343431 and 3434343433
4)3434343434343434343434343434343434339 and 3434343434343434343434343434343434341

is this some type of weird April fools joke ?[/SPOILER]

[QUOTE=R.D. Silverman;399092]Arithmetic is not math. These are not "math" problems.[/QUOTE]

maybe someone should change the wikipedia then ( hint hint)[QUOTE="http://en.wikipedia.org/wiki/Arithmetic"] Arithmetic or arithmetics (from the Greek ἀριθμός arithmos, "number") is the oldest[1] and most elementary branch of mathematics.[/QUOTE]

Congratulations to science_man_88 for being the first to come up with the correct answers!

[QUOTE=science_man_88;399093][SPOILER]is this some type of weird April fools joke ?[/SPOILER][/QUOTE]

[SPOILER]Yes, I guess you could say that.[/SPOILER] :smile:

Sounds like april fool joke but let's give it a try :razz:
[CODE]gp > precprime(20150401)
%1 = 20150399
gp > n=41414-41414%6; while(!isprime(n+1)||!isprime(n-1),n-=6); [n-1,n+1]
%2 = [41411, 41413]
gp > n=3434343434-3434343434%6; while(!isprime(n+1)||!isprime(n-1),n-=6); [n-1,n+1]
%3 = [3434343431, 3434343433]
gp > n=3434343434343434343434343434343434343-3434343434343434343434343434343434343%6; while(!isprime(n+1)||!isprime(n-1),n-=6); [n-1,n+1]
%4 = [3434343434343434343434343434343434339, 3434343434343434343434343434343434341]
gp >[/CODE]

hehe