### About the Number 503 (five hundred three)

It took @mathbabbler 509 days to tweet one kilotweet. While in the process of creating a nBAB for 509, MathBabbler learned that 509 was a sexy prime with `503`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
503 is a natural, whole, integer
503 is odd
503 proper divisors are: 1,
503 is deficient (sum of divisors is 1)
503 is unhappy
503 is not a Harshad number
503 is prime
...Cousin prime with 499
...Safe prime with 251
...Sexy prime with 509
...OEIS:002145 (4n+3; n=125)
...Left-truncatable
...Eisenstein
503 is the sum of 3 consecutive primes
503 = 163 + 167 + 173
503 in octal is 0767
503 in hexadecimal is 0x1f7
503 in binary is 111110111 (is evil)
503 nearest square numbers: -19...26 (484...529 )
sqrt(503) = 22.4277
ln(503) = 6.22059
log(503) = 2.70157
503 reciprocal is .00198807157057654075546719681908
503! is 1.54354e+1142
503 is 160.11 Pi years
503 is 25 score and 3 years
503 written as a Roman numeral is DIII
503 = 252^2 - 251^2 and 252 + 251 = 503
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 31 October 2010 