Euler Product - Notable Constants

Notable Constants

Many well known constants have Euler product expansions.

Twin prime constant:

Landau-Ramanujan constant:

Murata's constant (sequence A065485 in OEIS):

Strongly carefree constant  A065472:

Artin's constant  A005596:

Landau's totient constant  A082695:

Carefree constant  A065463:

(with reciprocal)  A065489:

Feller-Tornier constant  A065493:

Quadratic class number constant  A065465:

Totient summatory constant  A065483:

Sarnak's constant  A065476:

Carefree constant  A065464:

Strongly carefree constant  A065473:

Stephens' constant  A065478:

Barban's constant  A175640:

Taniguchi's constant  A175639:

Heath-Brown and Moroz constant  A118228:

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