Definition:Semiperfect Number/Sequence
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Definition
The sequence of semiperfect numbers begins:
- $6, 12, 18, 20, 24, 28, 30, \ldots$
This sequence is A005835 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $20$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $20$
- Weisstein, Eric W. "Pseudoperfect Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PseudoperfectNumber.html