3-1=2
7-4=3
13-6=7
19-8=11
29-10=19
But 37-12=Non Prime!
43-14
53-16
61-18
71-20 is not Prime, though.
I prefer something more simple like differential equations.
Nice
X^4 has 4 solution for non 0 x.
For instance if x^4 will equal 1, then x = 1,-1,i, -i
X^n has n solutions if n is a natural number.
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3-1=2
7-4=3
13-6=7
19-8=11
29-10=19
But 37-12=Non Prime!