Let the knowledge tree z = (n+x) 2-n 2 ... n, x = 1, 2...n (n and x are natural numbers).

Z=2nx+ 1

When x= 1, 2, 3, 4 ...

Z 1=2n+ 1 x= 1

Z2=4n+ 1 x=2

Z3=6n+ 1 x=3

Z4=8n+ 1 x=4

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Z 1, Z2, Z3, Z4 ... are all wisdom numbers required by the topic?

Observable quantity

Z 1=2n+ 1 x= 1

Z2=2(2n)+ 1 x=2

Z3=2(3n)+ 1 x=3

Z4=2(4n)+ 1 x=4

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All belong to

Z=2n+ 1

So the wisdom number Z=2n+ 1 (n= 1, 2,3 ...)

No. 1993 WisdomNo. Z1993 = 2 *1993+1= 3987.