Are All Triperfect Numbers Even?/Progress/Prime Factors
Theorem
An odd triperfect number has:
- at least $11$ distinct prime factors
- at least $32$ distinct prime factors if $3$ is not one of them.
Proof
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Sources
- Jan. 1982: Walter E. Beck and Rudolph M. Najar: A Lower Bound for Odd Triperfects (Math. Comp. Vol. 38, no. 157: 249 – 251) www.jstor.org/stable/2007481
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $120$
