Intended for: September 25, 2012
Timetable
- First draft entered by Alonso del Arte on September 18, 2012 ✓
- Draft reviewed by Daniel Forgues on September 24, 2012 ✓
- Draft to be approved by August 25, 2012
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A002064:
Cullen numbers
-
{ 1, 3, 9, 25, 65, 161, 385, 897, ... }
Grau proved that that there is no Cullen number with the
Lehmer property. Hence, if
, then
is
prime. A composite integer
is called a
Lehmer number if
, where
is the
totient function.