%I #11 Sep 04 2018 11:25:16
%S 27,57,77,87,117,147,177,187,207,217,237,247,267,287,297,327,357,377,
%T 387,407,417,427,437,447,477,497,507,517,527,537,567,597,627,637,657,
%U 667,687,697,707,717,737,747,767,777,807,817,837,847,867,897,917,927
%N Numbers ending in 7 which are not prime.
%H G. C. Greubel, <a href="/A053180/b053180.txt">Table of n, a(n) for n = 1..10000</a>
%t Select[Range[7,1000,10],!PrimeQ[#]&] (* _Harvey P. Dale_, Nov 03 2013 *)
%Y Intersection of A002808 (composites) and A017353 (ending with 7). - _Michel Marcus_, Sep 04 2018
%K easy,nonn,base
%O 1,1
%A _Enoch Haga_, Feb 29 2000