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%I #13 Sep 29 2018 00:33:00
%S 1,13,26,29,31,44,45,50,66,69,102,106,125,177,182,183,196,198,230,238,
%T 266,278,279,287,291,299,309,315,333,334,338,343,347,367,385,390,398,
%U 415,423,431,436,451,455,458,473,487,491,493,512,517,518,522,529,539,542,545,557,566,589
%N Numbers k such that A194113(k) is a prime.
%e For k=1, A194113(1)=3;
%e for k=13, A194113(13)=281;
%e for k=26, A194113(26)=1097.
%o (PARI) isok(n) = isprime(sum(k=1, n, floor(k*sqrt(10)))); \\ _Michel Marcus_, Sep 26 2018
%Y Cf. A194113.
%K nonn
%O 1,2
%A _Marius A. Burtea_, Sep 24 2018
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