Thread: Superprime gaps
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Old 2019-01-01, 18:18   #4
Bobby Jacobs
 
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May 2018

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These numbers are called prime-indexed primes or superprimes. They are of the form p(p(n)), where p(n) is the nth prime number.

p(p(1))=p(2)=3
p(p(2))=p(3)=5
p(p(3))=p(5)=11
p(p(4))=p(7)=17
p(p(5))=p(11)=31
p(p(6))=p(13)=41
p(p(7))=p(17)=59
p(p(8))=p(19)=67
p(p(9))=p(23)=83
p(p(10))=p(29)=109
...
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