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%I #12 Jun 19 2015 08:56:25
%S 677,6635777,28132417,156400037,234518597,381655297,386751557,
%T 403849217,820020497,1215498497,1298449157,1539463697,1580539537,
%U 1839037457,2072616677,2774550277,2969814017,6147500837,6194319617,6703351877,6937890437
%N Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime.
%C All terms == 7 mod 10. Subsequence of A121834.
%Y Cf. A001912, A121326.
%K nonn
%O 1,1
%A _Zak Seidov_, Mar 05 2015
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