Befreundete Zahlen/Regel von Thabit/Tabelle

${}k$	${}a=3\cdot 2^{k-1}-1$	${}b=3\cdot 2^{k}-1$	${}c=9\cdot 2^{2k-1}-1$	${}m=2^{k}ab$	${}n=2^{k}c$
${}2$	${}5$	${}11$	${}71$	${}220$	${}284$
${}3$	${}11$	${}23$	${}287=7\cdot 41{\text{ (nicht prim)}}$	${}\,$	${}\,$
${}4$	${}23$	${}47$	${}1151$	${}17296$	${}18416$
${}5$	${}47$	${}95$	${}4607=17\cdot 271{\text{ (nicht prim)}}$	${}\,$	${}\,$
${}6$	${}95=5\cdot 19{\text{ (nicht prim)}}$	${}191$	${}18431=7\cdot 2633{\text{ (nicht prim)}}$	${}\,$	${}\,$
${}7$	${}191$	${}383$	${}73727$	${}9363584$	${}9437056$

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