South African Skeptics

Famous numbers

Offline Rigil Kent

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Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

46664

149,597,870.7



Rigil

You know it's cold outside when you go outside and it's cold.


Offline st0nes

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Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

46664

149,597,870.7



Rigil


Pi
Nelson Mandela's prison number
My bank balance
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Offline Faerie

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Offline st0nes

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Tempora mutantur, nos et mutamur in illis

Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read.--Groucho Marx


Offline Mefiante

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The third number is the conversion from AU to km.

(They lied to you at school.  22/7 is not π.  It’s a rational approximation to π that already fails at the third decimal.  π is a transcendental number which means it has no finite expression involving only rationals and/or surds. A better rational approximation is 333/106.  An even better one is 103,993/33102.)

2.718281828459…

½ (1+√5)

7.29735×10–3

6.022×1023

0.577215664901…

299,792,458

As the man said, no peeking.

'Luthon64
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Offline bobilus

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Quote
2.718281828459…

½ (1+√5)

7.29735×10–3

6.022×1023

0.577215664901…

299,792,458

1. e^1

2. No idea

3. alpha, cant remember the name.

4. Avogadro constant

5. no clue.

6. Speed of light in vacuum (m/s)

Here is a few extra.

8.314

9.8066

6.62608 x 10-34

1.602177 x 10-19


Offline BoogieMonster

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Quote
½ (1+√5)

The golden ratio.

Wild guesses:

Quote
6.62608 x 10-34

mass of a neutrino...

Quote
1.602177 x 10-19

and electron? The second one rings a bell along those lines...
"Monkey killing monkey killing monkey over pieces of the ground, Silly monkeys, give them thumbs, they make a club and beat their brother down. How they survive, so misguided, is a mystery. Repugnant is a creature who would squander the ability to lift an eye to heaven, conscious of his fleeting time here" - Tool


Offline brianvds

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Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

Approximation of pi.

Quote
46664

Madiba.

Quote
149,597,870.7[/b]

Astronomical unit.

Well those are my guesses. Lemme scroll down and see if I was right. :-)



Offline Mefiante

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1. e^1

4. Avogadro constant

6. Speed of light in vacuum (m/s)
All correct. (No. 1. is the base of the natural, or Napierian, logarithm.)

2. No idea
BoogieMonster got that one right.  It’s the exact expression of the Golden Ratio, φ.

3. alpha, cant remember the name.
Yes, the symbol commonly used for this physical constant is α.  It’s the fine structure constant.

5. no clue.
A tricky one, this.  I won’t reveal it yet in case someone would like to guess.  (Hint:  It comes from number theory.  Its decimal and continued fraction expansions are both aperiodic but it is not known whether the number is algebraic or transcendental.)



8.314
That’s the gas constant (in SI units).

9.8066
The standard value of g (in SI units), the acceleration due to Earth’s gravitational field at mean sea level.

6.62608 x 10-34
Planck constant (in SI units), the basic unit of energy quanta in QM.

1.602177 x 10-19
Unit of electrical charge, Coulombs.

Two more, both around 4:

4.669201609…

4.186

'Luthon64
"Sensitive" people are now carefully examining the entire universe, trying to find something to be "offended" at. It won't stop until such time as the "offenders" learn to stop apologizing, and saying "freck off" instead. — brianvds, The ShoutBox Classics, 02/07/2018.


Offline Rigil Kent

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0.577215664901…
Is it the Riemann convergent thingy?


Rigil
You know it's cold outside when you go outside and it's cold.


Offline Mefiante

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Well, it is the value to which a particular expression converges but Riemann is not associated with it.  Another very famous mathematician is.

'Luthon64
"Sensitive" people are now carefully examining the entire universe, trying to find something to be "offended" at. It won't stop until such time as the "offenders" learn to stop apologizing, and saying "freck off" instead. — brianvds, The ShoutBox Classics, 02/07/2018.


Offline bobilus

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Offline Rigil Kent

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4.669201609… - The heat capacity of slightly more water ...    :D
You know it's cold outside when you go outside and it's cold.


Offline Rigil Kent

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A few more from pop culture:

22

42

101

664


You know it's cold outside when you go outside and it's cold.


Offline brianvds

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A few more from pop culture:

22

Catch-

Quote
42

Answer to life, the universe and everything.

Quote
101

Dalmatians? (I have actually never seen the film, or read the book, assuming there was a book in the first place.

Quote
664[/b]

No idea. I'm not THAT clued up on pop culture. :-)