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Template:Sequence of the Day for January 31

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Intended for: January 31, 2013

Timetable

  • First draft entered by Alonso del Arte on April 5, 2012
  • Draft to be reviewed by November 30, 2012
  • Draft to be approved by December 31, 2012

Yesterday's SOTD * Tomorrow's SOTD

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A051006: The prime constant.

0.4146825098511116...
The formula is

k  = 1
χp (k )
2k
, where
χp (n)
is the characteristic function of the primes. Essentially, this is an encoding of the prime numbers into a single real number in the unit interval.