%I A123979
%S A123979 1,3,8,16,23,38,51,71,73,108,141,156,166,178,198,233,271,288,346,376,
%T A123979 451,453,471,478,646,656,773,778,786,871,926,1003,1013,1031,1156,1213,
%U A123979 1311,1338,1543,1576,1618,1696,1751,1776,1793,1846,1856,1921,1933,1963
%N A123979 Numbers n for which 12n+1, 12n+5 and 12n+7 are primes.
%p A123979 a:=proc(n) if isprime(12*n+1)=true and isprime(12*n+5)=true and isprime(12*n+7)=true 
               then n else fi end: seq(a(n),n=1..2800); - Emeric Deutsch (deutsch(AT)duke.poly.edu), 
               Nov 06 2006
%t A123979 Select[Range[2000], And @@ PrimeQ /@ ({1, 5, 7} + 12#) &] (*Chandler*)
%Y A123979 Cf. A110801.
%Y A123979 Sequence in context: A094357 A136532 A030417 this_sequence A013583 A122794 
               A115006
%Y A123979 Adjacent sequences: A123976 A123977 A123978 this_sequence A123980 A123981 
               A123982
%K A123979 nonn
%O A123979 1,2
%A A123979 Artur Jasinski (grafix(AT)csl.pl), Oct 30 2006
%E A123979 Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 05 2006
%E A123979 More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 06 2006