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A153307 Numbers n such that 14*n+3 is not prime.

%I A153307 #11 Sep 08 2022 08:45:39
%S A153307 3,6,8,9,10,12,13,15,18,21,23,24,27,28,30,31,32,33,35,36,38,39,42,43,
%T A153307 45,48,49,50,51,52,53,54,57,58,60,62,63,64,65,66,68,69,72,73,75,76,77,
%U A153307 78,81,83,84,86,87,88,90
%N A153307 Numbers n such that 14*n+3 is not prime.
%H A153307 Vincenzo Librandi, <a href="/A153307/b153307.txt">Table of n, a(n) for n = 1..1000</a>
%e A153307 Distribution of the terms in the following triangular array:
%e A153307 *;
%e A153307 *,*;
%e A153307 *,*,*;
%e A153307 *,3,*,*;
%e A153307 *,*,*,*,*;
%e A153307 *,*,*,*,10,*;
%e A153307 3,*,*,*,*,*,*;
%e A153307 *,*,*,*,*,*,18,*;
%e A153307 *,*,*,12,*,*,*,*,*;
%e A153307 *,*,*,*,*,*,*,*,*,*;
%e A153307 *,8,*,*,*,*,*,*,31,*,*;
%e A153307 *,*,*,*,*,23,*,*,*,*,*;
%e A153307 *,*,*,*,21,*,*,*,*,*,*,48,*;etc.
%e A153307 where * marks the non-integer values of (2*h*k + k + h - 1)/7 with h >= k >= 1. - _Vincenzo Librandi_, Jan 17 2013
%t A153307 Select[Range[0, 200], !PrimeQ[14*# + 3]&] (* _Vincenzo Librandi_, Jan 12 2013 *)
%o A153307 (Magma) [n: n in [0..150] | not IsPrime(14*n + 3)]; // _Vincenzo Librandi_, Jan 12 2013
%Y A153307 A090614.
%K A153307 nonn,easy
%O A153307 1,1
%A A153307 _Vincenzo Librandi_, Dec 23 2008