Template:Sequence of the Day for December 20

Intended for: December 20, 2012

Timetable

• First draft entered by Alonso del Arte on April 4, 2012 based on remarks by Roger Bagula ✓
• Draft to be reviewed by October 20, 2012
• Draft to be approved by November 20, 2012

Yesterday's SOTD * Tomorrow's SOTD

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A119524: Decimal expansion of the van der Waerden–Ulam binary measure of the composites.

0.17063498029777...

The formula is

∞ ∑   k  = 1    k − 1 − π (k ) 2 k  ,

where

π (n)

is the prime counting function. The primes have a larger measure than the composites because they dominate the smaller integers.