261was 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 for261, 262 became the smallest number without a nBAB on 7 April 2016.MathBabbler Number Analyst (MBNA) output: ========================================= 261 is a natural, whole, integer 261 is odd 261 proper divisors are: 1,3,9,29,87, 261 has 5 proper divisors 261 is deficient (sum of divisors is 129; ratio: 0.494253) 261 is unhappy 261 is not a Squarefree Number: 9, 261 is Harshad (Niven) number 261 is composite (not prime) 261 has the prime factors: 3*3*29 (sum=35) 261 is a 29-smooth number 261 is a Moran Number 261 is a lucky number 261 is Arithmetic (A003601) 261 in octal is 0405 261 in hexadecimal is 0x105 261 in binary is 100000101 (is odious) 261 nearest square numbers: -5...28 (256...289 [17]) sqrt(261) = 16.1555 ln(261) = 5.56452 log(261) = 2.41664 261 reciprocal is .00383141762452107279693486590038 261! is 9.99681e+518 261 is 83.0789 Pi years 261 is 13 score and 1 year 261 written as a Roman numeral is CCLXI 261 is 131^2 - 130^2 and 131 + 130 = 261 261 is a multiple of 1 & it contains a 1 (A011531)

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

**Created:** 07 April 2016

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