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%I #9 Sep 08 2022 08:46:19
%S 1,8,15,22,36,50,57,64,78,85,92,99,106,120,134,141,148,155,162,169,
%T 176,183,190,204,218,225,232,246,253,260,267,274,288,295,302,309,316,
%U 323,330,344,351,358,365,372,386,393,400,407,414,428,435,442,456,470,477,484,498
%N Nonprimes of the form 7*k + 1.
%C Subsequence of A018252.
%t DeleteCases[7 Range[0, 200] + 1, _?PrimeQ]
%o (Magma) [n: n in [1..500 by 7] | not IsPrime(n)];
%Y Cf. A016993, A091113, A091300, A140444, A291745, A291746.
%K nonn,easy
%O 1,2
%A _Vincenzo Librandi_, Aug 31 2017
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