%I #6 Mar 30 2012 18:52:45
%S 4,6,9,34,51,55,86,94,129,142,183,185,202,214,218,247,249,302,341,394,
%T 415,446,471,473,535,583,634,698,723,737,807,851,905,922,926,949,1042,
%U 1138,1149,1205,1211,1241,1257,1262,1313,1315,1337,1346,1402,1527,1546,1577,1594,1642,1646,1673,1687
%N Semiprimes s such that tau(s-1)=tau(s+1) where tau=A000005.
%F A001358 INTERSECT A067888.
%Y Cf. A001358, A067888, A067889.
%K nonn
%O 1,1
%A _Juri-Stepan Gerasimov_, Jun 26 2011