381was the smallest number that didn't have a nBAB on 2 January 2017. The next smallest number without a nBAB is 382. Note: 382 to 398, inclusive, did not have nBABs when this nBAB was created.MathBabbler Number Analyst (MBNA) output: ========================================= 381 is natural, counting, whole, integer 381 is odd (not even) 381 is not extremely odd 381 proper divisors are: 1,3,127, 381 has 3 proper divisors 381 is deficient (sum of divisors is 131; ratio: 0.343832) 381 is unhappy 381 is a Squarefree Number 381 is composite (not prime) 381 has the prime factors: 3*127 (sum=130) 381 is semiprime (biprime or 2-almost prime) 381 is a 127-smooth number 381 is Arithmetic (A003601) 381 is the sum of 16 consecutive primes 381 = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 381 in octal is 0575 381 in hexadecimal is 0x17d 381 in binary is 101111101 (is odious)(is palindromic) 381 nearest square numbers: -20...19 (361...400 [20]) sqrt(381) = 19.5192 ln(381) = 5.9428 log(381) = 2.58092 381! is 3.59638e+819 381 is 121.276 Pi years 381 is 19 score and 1 year 381 written as a Roman numeral is CCCLXXXI 381 is 191^2 - 190^2 and 191 + 190 = 381 381 is a multiple of 1 & it contains a 1 (A011531) 381 is a multiple of 3 & it contains a 3 (A121023) __________________________________________ 381 reciprocal is 0.002624671916010498687664041994750656167979 remainders: 1,10,100,238,94,178,256,274,73,349,61,229,4,40,19,190,376,331,262,334,292,253,244,154,16,160,76,379,361,181,286,193,25,250,214,235,64,259,304,373,301,343,1

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 02 January 2017

This work is licensed under a Creative Commons Attribution 3.0 United States License.