The OEIS A117746 (n^2 - n - 1 and an alternate) nBAB collection was created on 21 February 2014. Note: The number 8371 was responsible for its creation. The MBNA was modified to check for numbers in the OEIS A117746 sequence and on 2 March 2014 the number

209was the smallest number in the sequence that didn't have a nBAB.MathBabbler Number Analyst (MBNA) output: ========================================= 209 is a natural, whole, integer 209 is odd 209 proper divisors are: 1,11,19, 209 has 3 proper divisors 209 is deficient (sum of divisors is 31; ratio: 0.148325) 209 is unhappy 209 is a Squarefree Number 209 is Harshad (Niven) number 209 is composite (not prime) 209 has the prime factors: 11*19 (sum=30) 209 is semiprime (biprime or 2-almost prime) 209 is in OEIS::A117746 209 in octal is 0321 209 in hexadecimal is 0xd1 209 in binary is 11010001 (is evil) 209 nearest square numbers: -13...16 (196...225 [15]) sqrt(209) = 14.4568 ln(209) = 5.34233 log(209) = 2.32015 209 reciprocal is .00478468899521531100478468899521 209 is 66.5268 Pi years 209 is 10 score and 9 years 209 written as a Roman numeral is CCIX 209 is 105^2 - 104^2 and 105 + 104 = 209The following was in the Wikipedia entry for the number

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209209= 1^6 + 2^5 + 3^4 + 4^3 + 5^2 + 6^1

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

**Created:** 02 March 2014

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