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This is inspired by the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles, now with numbers.


If a number conforms to a special rule, I call it a Special Prime Number™.

Use the following examples below to find the rule:

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Why are these called Special Prime Numbers™?

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7
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They are Special Prime because they are

Super-prime, namely prime-indexed primes.

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I believe the answer is

The special primes are the n:th prime, where n is odd. The non-special primes are the n:th prime where n is even. F ex 11 is the 5th prime, 83 is the 23th prime... And 7 is the 4:th prime, 101 is the 26:th prime etc..

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