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[neogaffer1]

So this showed up all over my dorm hall floor today.

Seeing as how the top and bottom are hexadecimal, and the middle is binary, I scanned it and used OneNote's OCR and a OCR site to find the text.

The hexadecimal on top translates into: "??The folowing is a cypher. Solve? it to find twenty dollars.?" The one on the bottom translates into: "Hint: semi-prime numbers??" (using http://string-functions.com/hex-string.aspx). Semi-prime numbers are numbers that are either prime or only have primes and themselves as factors. For the binary, it does not convert into ASCII or actual binary; around this time was when I found out that it was one of my friends who had created the riddle. He made a few things clear:

• There are 158 1's and 401 0's. Both of these numbers are semiprime.
• It isn't actually binary.
• There is no $20 at the end of it, but there is a prize.
• The semiprime numbers clue is a "very good" hint.

Anybody on GAF know much about semiprimes?

1 1 1 1 1 0 0 1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 0 0 1 0 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 1 0 0 0 0 1 0 1 0 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 1 1 10 0 1 0 0 0 0 1 0 0 1 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 1 0 0 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 1 1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 1 0 1 1 0 0 1 1 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 1 0 0 1 1 1 1 1 0 0 1 1 1 0 0 0 0 0 1 1 0 0 0 1 1 1 1 1 0 0 0 0 0

 

[Orbis Tabula]

Take every digit from the string in a place that's a semiprime and see if that's a binary string.

Semi prime is a product of two primes, I believe.

4 6 9 10 14 15...

Also, be wary for April Fools.

 

[Lucis]

Ascii chart on the first part
don't even need to look at it
0x20 is space
everything else in the letter range

edit, damn i need to read the rest of the message
pq is usually used in cryptography (such as RSA)
but usually you need 2 primes to create one semiprime.

edit2,
401 is a prime not a semi prime, prime numbers are not semi prime

 

[chuckddd]

Be sure to...

 

[xxracerxx]

Is this the code to get laid?

 

[Rapstah]

Semi-primes are the product of two primes. Every number is either a prime or a product of primes if you don't number the number of factors, you know.

 

[freenudemacusers]

your prize will be solving the riddle.

just letting you know before you get too invested.

 

[neogaffer1]

Take every digit from the string in a place that's a semiprime and see if that's a binary string.

Semi prime is a product of two primes, I believe.

4 6 9 10 14 15...

Also, be wary for April Fools.

Asked him, he said that that's not it. He's also pretty trustworthy, so I believe him when he says there's a prize at the end.

 

[Rapstah]

Maybe the hexademical numbers that didn't correspond to any letters ("?") are clues.