The Egyptians used it in constructing their pyramids but Archimedes was the first to estimate it rogorously.

6 points - added 14 years ago by kris -

2.

Napier's constant or 2.71828...

Also called Euler's number. In 2004, Larry Page and Sergey Brin paid homage to it when Google's IPO intended to raise $2,718,281,828.

4 points - added 14 years ago by kris -

3.

Zero or 0

It looks easy now but once the idea of zero was so difficult to grasp, it was vehemently rejected.

1 point - added 14 years ago by kris -

4.

Theodorus' constant or 1.73205...

1 point - added 14 years ago by kris -

5.

Rabbit constant or 0.70980...

1 point - added 14 years ago by kris -

6.

Magata constant or 3.40706...

1 point - added 14 years ago by kris -

7.

Omega constant or 0.56714...

1 point - added 14 years ago by kris -

8.

Phi or 1.61803...

Also called the Golden ratio. It is perhaps the one mathematical constant obsessed over outside science.

0 points - added 14 years ago by kris -

9.

Pythagoras' constant or 1.41421...

Babylonians and ancient Indians knew it but the Greeks forbade detested it as an irrational number until Pythagoras.

0 points - added 14 years ago by kris -

10.

Plastic constant or 1.32471...

0 points - added 14 years ago by kris -

11.

Ramanujan constant or 262537...

Even though the famed Rmanujan discovered a number of constants, this is not one of them. It was ascribed to him as an April Fool's joke.

0 points - added 14 years ago by kris -

12.

The Traveling Salesman constant or 0.71478...

0 points - added 14 years ago by kris -

13.

Twin Prime constant or 0.66061...

0 points - added 14 years ago by kris -

14.

Pi*Pi pr 9.86960...

0 points - added 14 years ago by kris -

15.

Catalan's constant or 0.91596...

0 points - added 14 years ago by kris -

16.

Renyi constant or parking constant or 0.74759...

0 points - added 14 years ago by kris -

17.

Second Tree-Growth constant or 0.43992...

0 points - added 14 years ago by kris -

18.

Laplace limit or 0.66274...

0 points - added 14 years ago by kris -

19.

Levy's constant or 3.27582...

0 points - added 14 years ago by kris -

20.

Lieb's square ice constant or 1.53960...

0 points - added 14 years ago by kris -

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