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Template:Sequence of the Day for April 12

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Intended for: April 12, 2013

Timetable

  • First draft entered by Alonso del Arte on April 6, 2012
  • Draft reviewed by Daniel Forgues onApril 13, 2016
  • Draft to be approved by March 12, 2013

Yesterday's SOTD * Tomorrow's SOTD

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A065442: Decimal expansion of the Erdős–Borwein constant

k  = 1
1
2k  −  1
.
1.60669515241529...
In 1948, Paul Erdős proved that this number is irrational. We can't say for sure if the related number

k  = 1
χp (2k  −  1)
2k  −  1
(see A173898) is also irrational. (  
χp(n)
is the characteristic function of the primes).