This nBAB about the number

`was created in order to complete nBABs for the numbers 10 through 19.`

15MathBabbler Number Analyst (MBNA) output: ========================================= 15 is a natural, whole, integer 15 is odd 15 proper divisors are: 1,3,5, 15 is deficient (sum of divisors is 9) 15 is unhappy 15 is not a Harshad number 15 is not prime 15 is undulating 15 has the prime factors: 3*5 15 is semiprime (biprime or 2-almost prime) 15 in octal is 017 15 in hexadecimal is 0xf 15 in binary is 1111 (is evil) 15 nearest square numbers: -6...1 (9...16 [4]) sqrt(15) = 3.87298 ln(15) = 2.70805 log(15) = 1.17609 15 reciprocal is .06666666666666666666666666666666 15! is 1.30767e+12 15 is 4.77465 Pi years 15 is 0 score and 15 years 15 written as a Roman numeral is XVMathBabbler posted this nBAB for the number

`immediately after posting a nBAB for the number 17 and 17 in octal (base-8) equals`

15`.`

15Note to MathBabbler:

`is a Ruth-Aaron pair when repeated prime factors are counted. {Wikipedia.org::Ruth-Aaron Pair}`

15

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

**Created:** 17 March 2009

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