[seqfan] Reference that "A027687 4-perfect numbers" is finite
Georgi Guninski
guninski at guninski.com
Sun Jul 15 16:31:29 CEST 2012
What is the reference that A027687 is finite?
Some searches show this as conjecture for k>=3.
Any reference for k-perfect numbers, k>=4 will do.
Thanks.
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