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%I #6 Jan 04 2019 20:17:27
%S 11,12,13,14,15,16,17,18,19,20,21,22,23,25,27,29,31,33,35,37,41,43,47,
%T 49,53,55,59,61,67,71,73,77,79,83,89,97,101,103,107,109,113,121,127,
%U 131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227
%N a(n) = A162531(n)/11.
%C The only composite terms are 12,14,15,16,18,20,21,22,25,27,33,35,49,55,77,121.
%C After a(42) = 11^2 = 121 all terms are primes: n > 42, a(n) = A000040(n-12).
%Y Cf. A162531 (Numbers k whose largest divisor <= sqrt(k) equals 11), A000040 (Prime numbers).
%Y Cf. A161344, A162531, A162790, A162792.
%K nonn
%O 1,1
%A _Omar E. Pol_ and _Zak Seidov_, Jul 13 2009