This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A060518 #6 Mar 30 2012 18:34:55 %S A060518 367,863,907,1327,1549,1579,1607,1619,1697,2221,2267,2551,2671,2677, %T A060518 2693,2719,2837,3209,3313,4049,4373,4391,4909,5261,5669,5693,6007, %U A060518 6269,6343,6547,6653,6703,6857,6907,7013,7559,7573,7583,7669,7723,7919 %N A060518 Primes p that have exactly two primitive roots that are not primitive roots mod p^2. %C A060518 If x is a primitive root mod prime p then either x is a primitive root mod p^2 or x has order p-1 mod p^2. %e A060518 159 and 205 are primitive roots mod 367, but not mod 367^2. %Y A060518 Cf. A060503, A055578, A060519, A060520. %K A060518 nonn %O A060518 1,1 %A A060518 _Jud McCranie_, Mar 24 2001