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%I #24 May 24 2021 14:23:34
%S 7,19,37,31,127,197,97,181,191,463,421,937,337,1321,881,2347,3889,
%T 2699,1861,1009,2861,1979,3793,1951,2861,3889,1933,1973,4831,1861,
%U 7393,8053,8297,5881,8209,3257,7753,17551,7841,6971,16843,16943,15401,12781,17573,41549,12097
%N a(n) is the largest prime p congruent to 1 mod n such that the multiplicative subgroup H of (Z/pZ)* of index n contains no nontrivial mod-p arithmetic progression of length 3.
%H Jeremy F. Alm, <a href="/A298566/a298566.ipynb.txt">Python program</a>
%o (Python) see links.
%Y Less than A298566.
%K nonn
%O 2,1
%A _Jeremy F. Alm_, Jan 21 2018
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