4
$\begingroup$

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:

A Special Prime Number™ Not a Special Prime Number™
11 7
83 101
283 313
5503 6397
7883 7901

Why are these called Special Prime Numbers™?

CSV version:

A Special Prime Number™, Not a Special Prime Number™
11,7
83,101
283,313
5503,6397
7883,7901
Improve this question
$\endgroup$

2 Answers 2

Reset to default
7
$\begingroup$

They are Special Prime because they are

Super-prime, namely prime-indexed primes.

Improve this answer
$\endgroup$
0
$\begingroup$

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..

Improve this answer
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.