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A121519 Number of primitive roots of prime A103203(n). 3

%I

%S 1,2,4,8,10,12,16,22,24,28,40,52,64,72,82,84,88,112,128,130,132,144,

%T 156,172,178,190,192,232,238,250,252,276,280,292,324,358,384,396,400,

%U 418,424,430,442,448,480,490,508,520,544,552,592,612,640,652,658,682,712

%N Number of primitive roots of prime A103203(n).

%C Also records in A008330.

%H Amiram Eldar, <a href="/A121519/b121519.txt">Table of n, a(n) for n = 1..10000</a>

%e Prime A103203(5) = 23 has 10 primitive roots, so a(5) = 10; 23 = prime(9) and A008330(9) = 10 is a record in A008330.

%o (PARI) r=0;for(n=1,230,k=eulerphi(prime(n)-1);if(r<k,r=k;print1(k,",")))

%Y Cf. A008330, A103203.

%K nonn

%O 1,2

%A _Klaus Brockhaus_, Aug 06 2006

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Last modified October 26 18:30 EDT 2021. Contains 348268 sequences. (Running on oeis4.)