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%I #6 Mar 31 2012 14:11:24
%S 11,41,251,641,4001,68891,121001,163841,198811,466561,497291,1115561,
%T 2560361,6561001,6806251,7516891,11793961,13712411,34633211,47436841,
%U 52670251,71824001,84739211
%N a(n) is the first term of the sexy prime quadruple a(n), a(n)+6, a(n)+12 and a(n)+18 that becomes a perfect square if the rightmost digit (1) is removed.
%e a(6)=68891. Removing the rightmost digit results in 6889 = 83^2.
%Y Cf. A023201, A046117.
%K nonn,base
%O 1,1
%A _Ray G. Opao_, Mar 24 2004