Knödel Numbers

For every , let be the set of Composite numbers such that if , GCD (where GCD is the Greatest Common Divisor), then . is the set of Carmichael Numbers. Makowski (1962/1963) proved that there are infinitely many members of for .

Makowski, A. Generalization of Morrow's -Numbers.'' Simon Stevin 36, 71, 1962/1963.