### About the Number 257 (two hundred fifty-seven)

On 14 September 2013 somebody tweeted about 14 September 1752 and how that was the start of the Gregroian calendar. They also mentioned that 14 September 2013 (which I proclaim is Square-Root September Pi Day) was also the 257th day of the year and that 257 was a Fermat Number.

Fermat Numbers are defined by the following function.

```   F(n) = 2^(2^n) + 1, n ≥ 0
```

The MBNA was not checking for Fermat numbers when this nBAB was created on 15 September 2013.

```MathBabbler Number Analyst (MBNA) output:
=========================================
257 is a natural, whole, integer
257 is odd
257 proper divisors are: 1,
257 is deficient (sum of divisors is 1)
257 is unhappy
257 is a Squarefree Number
257 is not a Harshad number
257 is prime
...Sexy prime with 263
...Sexy Triplet prime with 263, 269
...Sexy prime with 251
...Truman Gerald prime with 227
...Pythagorean
...Eisenstein
257 in octal is 0401
257 in binary is 100000001 (is evil)
257 nearest square numbers: -1...32 (256...289 [17])
sqrt(257) = 16.0312
ln(257) = 5.54908
log(257) = 2.40993
257 reciprocal is .00389105058365758754863813229571
257! is 2.20459e+509
257 is 81.8056 Pi years
257 is 12 score and 17 years
257 written as a Roman numeral is CCLVII
257 = 129^2 - 128^2 and 129 + 128 = 257
```
##### Update::2015.02.22

MathBabbler watched an episode of Bob Burgers on 21 February 2015 during which he heard frequent mention of the number 257.

`@BobsBurgersFOX` tweeted the following on `2014.12.14`.

```   "Troop 257? They're the roughest troop in town. I heard they hold
hot dogs in the fire with their bare hands" - Tina #bobsburgers
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 15 September 2013