%I #13 Oct 09 2020 14:45:48

%S 2,11,11,7,11,19,17,29,29,29,37,37,43,43,61,53,61,71,89,79,73,79,83,

%T 103,97,103,107,109,113,127,131,151,137,151,157,197,167,167,173,181,

%U 211,199,191,197,199,211,227,257,257,241,233,251,257,251,263,263,269

%N a(n) is the smallest prime that is not less than prime(n) and is such that prime(n)*a(n)+2 is semiprime.

%C Motivated by a question about arranging square tiles in a rectangle.

%Y Cf. A000040, A001358, A092207, A198327, A338048.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Oct 08 2020, based on an email from _Todor Szimeonov_, Oct 07 2020