(idea) by abiessu Sat Dec 01 2001 at 2:15:00
Natural numbers a and b are said to be co-anti-prime iff there does not exist any k such that k is an anti-divisor of both a and b.

Note that all numbers of the form 2k+1 are prime iff k and k+1 are co-anti-prime. Note further the connection to coprime.
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