Template:Sequence of the Day for February 6

Intended for: February 6, 2013

Timetable

• First draft entered by Charles R Greathouse IV on November 9, 2011 ✓
• Draft reviewed by Alonso del Arte on January 12, 2012 ✓
• Draft to be approved by January 6, 2013

Yesterday's SOTD * Tomorrow's SOTD

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A144226: Prime numbers containing equal number of odd and even digits.

{ 23, 29, 41, 43, 47, 61, 67, 83, 89, 1009, 1021, 1049, ... }

It seems ‘obvious’ that this sequence contains only a thin fraction of the primes, but can this be proved? More precisely, is

lim inf a (n) pn =  + ∞

?