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A192220 Semiprimes s such that tau(s-1)=tau(s+1) where tau=A000005. 0

%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

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)