### About the Number 311 (three hundred eleven)

The number `311` was the smallest number that didn't have a nBAB on 28 April 2016. After this nBAB for `311` was posted, the number 312 was the smallest number without a nBAB.

```MathBabbler Number Analyst (MBNA) output:
=========================================
311 is a natural, whole, integer
311 is odd
311 proper divisors are: 1,
311 has 1 proper divisors
311 is deficient (sum of divisors is 1; ratio: 0.00321543)
311 is unhappy
311 is a Squarefree Number
311 is prime (not composite)
...Cousin prime with 307
...Sexy prime with 317
...Sexy Quadruple prime with 299, 305, 317
...Twin prime with 313
...Truman Gerald prime with 281
...OEIS:002145 (4n+3; n=77)
...reversible prime with 113
...Left-truncatable
...Right-truncatable
...Eisenstein
...prime triplet {307, 311, 313}
...prime triplet {311, 313, 317}
311 is Arithmetic (A003601)
311 is the sum of 11 consecutive primes
311 = 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47
311 in octal is 0467
311 in hexadecimal is 0x137
311 in binary is 100110111 (is evil)
311 nearest square numbers: -22...13 (289...324 )
sqrt(311) = 17.6352
ln(311) = 5.73979
log(311) = 2.49276
311 reciprocal is .00321543408360128617363344051446
311! is 6.73726e+641
311 is 98.9944 Pi years
311 is 15 score and 11 years
311 written as a Roman numeral is CCCXI
311 is 156^2 - 155^2 and 156 + 155 = 311
311 is a multiple of 1 & it contains a 1 (A011531)
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 28 April 2016 