Here's a short story:

500 (five hundred) is the natural number following 499 and preceding 501. 

500 is a Harshad number in bases 5, 6, 10, 11, 13, 15 and 16. 

Five hundred is also 



501 = 3 × 167. It is: 502 = 2 × 251, also a proposed HTTP status code for indicating server is temporarily overloaded, SMTP status code meaning command not implemented 503 is: 504 = 2 × 3 × 7. It is: 505 = 5 × 101, Harshad number in bases 3, 5 and 6 

This number is the magic constant of "n"×"n" normal magic square and "n"-queens problem for "n" = 10. 

New Mexico – Before October 7, 2007, The United States state of New Mexico had a single area code of 505. The state was, and still is, referred to as 'the 505' in slang. 506 = 2 × 11 × 23. It is: 507 = 3 × 13, Harshad number in bases 13 and 14. 508 = 2 × 127, sum of four consecutive primes (113 + 127 + 131 + 137), Harshad number in base 13. 509 is: 

510 = 2 × 3 × 5 × 17. It is: 511 = 7 × 73. It is: 512 = 2. It is: 513 = 3 × 19. It is: 514 = 2 × 257, it is: 515 = 5 × 103, it is: 516 = 2 × 3 × 43, it is: 517 = 11 × 47, it is: 518 = 2 × 7 × 37, it is: 519 = 3 × 173, it is: (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: what date did the area code change in NM
Guess: October 7, 2007,
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: what was the code

505