On 25 July 2008, computer science professor Randy Pausch died from pancreatic cancer, but I didn't get to blog about it until yesterday (August 3rd). Dr. Pausch was 47 years young at the time of his death.

Today, 4 August 2008, U.S. presidential candidate Barack Obama turned 47 years of old.

Here is stuff about the number 47.

47 is a natural, whole, integer 47 is odd 47 is unhappy 47 is not a Harshad number 47 is prime ...Cousin prime with 43 ...Safe prime with 23 ...Sexy prime with 53 ...Sexy prime with 41 ...OEIS:002145 (4n+3; n=11) ...Left-truncatable ...prime triplet {41, 43, 47} 47 is undulating 47 in octal is 057 47 in hexadecimal is 0x2f 47 in binary is 101111 (is odious) 47 nearest square numbers: -11...2 (36 [6]...49 [7]) sqrt(47) = 6.85565 ln(47) = 3.85015 log(47) = 1.6721 47 reciprocal is 0.02127659574468085106382978723404 47 is 14.9606 Pi years 47 is 2 score and 7 yearsMathBabbler first...

47is aCarolnumber.a(n) = (2^n - 1)^2 - 2 a(1) = (2^1 - 1)^2 - 2 = (2 - 1)^2 - 2 = 1^2 - 2 = 1 - 2 = -1 a(2) = (2^2 - 1)^2 - 2 = (4 - 1)^2 - 2 = 3^2 - 2 = 9 - 2 = 7 a(3) = (2^3 - 1)^2 - 2 = (8 - 1)^2 - 2 = 7^2 - 2 = 49 - 2 = 47About

47from the Cloudy Cloud Calculator...47 + 2 = 49 and 47 * 2 = 94MathBabbler was born in 19

47+ 10.RoadHacker has driven on MO Hwy-

47and NM Hwy-47.Hmmm... do all numbers equal

47? tech.groups.yahoo.com## Update::2012.09.19

BAB::The Percent 47% Has Gone Viral [19 September 2012]

## Update::2013.01.21

GDT had fun with the number

47on 21 January 2013.MathBabbler Number Analyst (MBNA) output: ========================================= 47 is a natural, whole, integer 47 is odd 47 proper divisors are: 1, 47 is deficient (sum of divisors is 1) 47 is unhappy 47 is a Squarefree Number 47 is not a Harshad number 47 is prime ...Cousin prime with 43 ...Safe prime with 23 ...Sexy prime with 53 ...Sexy Triplet prime with 53, 59 ...Sexy prime with 41 ...Truman Gerald prime with 17 ...OEIS:002145 (4n+3; n=11) ...Left-truncatable ...Eisenstein ...prime triplet {41, 43, 47} 47 is undulating 47 is a Lucas number(29+18) 47 is a Thabit number 47 is ThurmNumber 47 in octal is 057 47 in hexadecimal is 0x2f 47 in binary is 101111 (is odious) 47 nearest square numbers: -11...2 (36...49 [7]) sqrt(47) = 6.85565 ln(47) = 3.85015 log(47) = 1.6721 47 reciprocal is .02127659574468085106382978723404 47! is 2.58623e+59 47 is 14.9606 Pi years 47 is 2 score and 7 years 47 written as a Roman numeral is XLVII 47 = 24^2 - 23^2 and 24 + 23 = 47

47_{12}is 55 and MathBabbler was 55 years young when he record this update.

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

**Created:** 04 August 2008

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