Template:Sequence of the Day for September 8

Intended for: September 8, 2013

Timetable

• First draft entered by Alonso del Arte on May 31, 2011 (as a verbatim copy of the write-up from December 8, 2010) ✓
• Draft reviewed by Alonso del Arte on September 3, 2011 ✓
• Draft approved by Daniel Forgues on September 8, 2012 ✓

Yesterday's SOTD * Tomorrow's SOTD

The line below marks the end of the <noinclude> ... </noinclude> section.

---

A051250: Numbers whose reduced residue system consists of 1 and prime powers only.

{ 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14, 18, 20, 24, 30, 42, 60, ...? }

Reinhard Zumkeller has conjectured that this sequence is finite and given in full. He has verified it up to 10 7. If true, that would mean that there is no need for the ellipses above.