### About the Number 253 (two hundred fifty-three)

253 was the smallest number that didn't have a nBAB on 7 April 2016. MathBabbler is trying to ensure that the numbers 0-300 have nBABs by the end of the Spring 2016 Semester. With the posting of this nBAB for 253, 254 became the smallest number without a nBAB on 7 April 2016.

```MathBabbler Number Analyst (MBNA) output:
=========================================
253 is a natural, whole, integer
253 is odd
253 proper divisors are: 1,11,23,
253 has 3 proper divisors
253 is deficient (sum of divisors is 35; ratio: 0.13834)
253 is unhappy
253 is a Squarefree Number
253 is composite (not prime)
253 has the prime factors: 11*23 (sum=34)
253 is semiprime (biprime or 2-almost prime)
253 is a 23-smooth number
253 is centered dodecagonal
253 is triangular
253 is Arithmetic (A003601)
253 is the sum of 9 consecutive primes
253 = 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43
253 in octal is 0375
253 in hexadecimal is 0xfd
253 in binary is 11111101 (is odious)
253 nearest square numbers: -28...3 (225...256 )
sqrt(253) = 15.906
ln(253) = 5.53339
log(253) = 2.40312
253 reciprocal is .00395256916996047430830039525691
253! is 5.17346e+499
253 is 80.5324 Pi years
253 is 12 score and 13 years
253 written as a Roman numeral is CCLIII
253 is 127^2 - 126^2 and 127 + 126 = 253
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 07 April 2016 