Observe the number chart and answer the following question:

$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$11$	$12$	$13$	$14$	$15$	$16$	$17$	$18$	$19$	$20$
$21$	$22$	$23$	$24$	$25$	$26$	$27$	$28$	$29$	$30$
$31$	$32$	$33$	$34$	$35$	$36$	$37$	$38$	$39$	$40$
$41$	$42$	$43$	$44$	$45$	$46$	$47$	$48$	$49$	$50$
$51$	$52$	$53$	$54$	$55$	$56$	$57$	$58$	$59$	$60$
$61$	$62$	$63$	$64$	$65$	$66$	$67$	$68$	$69$	$70$
$71$	$72$	$73$	$74$	$75$	$76$	$77$	$78$	$79$	$80$
$81$	$82$	$83$	$84$	$85$	$86$	$87$	$88$	$89$	$90$
$91$	$92$	$93$	$94$	$95$	$96$	$97$	$98$	$99$

Colour the odd numbers in the chart with blue. Observe the uncoloured numbers. What can you say about them.