### About the Number 281 (two hundred eighty-one)

While creating a nBAB for the number 251, MathBabbler noticed it is a Truman-Gerald Pair with the number 281. Note: A Truman-Gerald Pair are two prime numbers that differ by 30.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
281 is a natural, whole, integer
281 is odd
281 proper divisors are: 1,
281 is deficient (sum of divisors is 1)
281 is unhappy
281 is a Squarefree Number
281 is not a Harshad number
281 is prime
...Cousin prime with 277
...Sophie Germain prime with 563
...Twin prime with 283
...Truman Gerald prime with 311
...Truman Gerald prime with 251
...Pythagorean
...Eisenstein
...prime triplet {277, 281, 283}
281 is the sum of 14 consecutive primes
281 = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43
281 in octal is 0431
281 in hexadecimal is 0x119
281 in binary is 100011001 (is evil)
281 nearest square numbers: -25...8 (256...289 )
sqrt(281) = 16.7631
ln(281) = 5.63835
log(281) = 2.44871
281 reciprocal is .00355871886120996441281138790035
281! is 4.71301e+567
281 is 89.4451 Pi years
281 is 14 score and 1 year
281 written as a Roman numeral is CCLXXXI
281 = 141^2 - 140^2 and 141 + 140 = 281
```

`log6(281)` = 3.14683, which when truncated to two decimal digits equals Pi rounded to the nearest hundredth.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 27 June 2012 