Template:Sequence of the Day for December 12

Intended for: December 12, 2011

Timetable

• First draft entered by Alonso del Arte on August 27, 2011 ✓
• Draft to be reviewed by October 12, 2011
• Draft to be approved by November 12, 2011

Yesterday's SOTD * Tomorrow's SOTD

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A033880: Abundance of

n

.

{ ..., −14, 0, −28, 12, −30, −1, −18, ... }

The negative

a (n)

in this listing correspond to deficient numbers, the zeros correspond to perfect numbers and the positives correspond to abundant numbers. I’m choosing to start the listing here from 27 in order to get a better mix of abundant, perfect and deficient numbers.