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# Mathematical constants

From OeisWiki

C.f. Steven R: Finch’s book Mathematical Constants.

## Well-known constants

- Pythagoras’ constant

(a quadratic number)√ 2 - Golden mean

(a quadratic number)*ϕ*=1 + √ 52 - Archimedes’ constant

(a transcendental number)π - Euler’s number

(a transcendental number)*e* - Euler–Mascheroni constant

(not even known whether an irrational number or not!)*γ* - Gelfond’s constant

(a transcendental number)*e*π - Ramanujan’s constant
*e*π√ 163 -
*i**i*=*e*− π / 2 -

(conjectured to be a transcendental number)π *e* - Apéry’s constant

(an irrational number, not known whether a transcendental number or not)*ζ*(3) - Brun’s constant