This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A114845 #20 May 30 2025 10:11:34
%S A114845 4,14,38,134,254,13238,252254,691958,952814,3316238,30364918838,
%T A114845 210339665174,575167942574
%N A114845 Slowest growing sequence of semiprimes having the semiprime-pairwise-average property: for any i,j, (a(i)+a(j))/2 is semiprime.
%C A114845 Semiprime analog of A113875.
%F A114845 a(n) = 2*A164979(n).
%e A114845 The pairwise average of the semiprimes {4 = 2^2, 14 = 2*7} is {9 = 3^2}.
%e A114845 The pairwise averages of the semiprimes {4, 14, 38} are {9, 21, 26}.
%e A114845 The pairwise averages of the semiprimes {4, 14, 38, 134} are {9, 21, 26, 69, 74, 86}.
%e A114845 The pairwise averages of the semiprimes {4, 14, 38, 134, 254} are {9, 21, 26, 69, 74, 86, 129, 134, 146, 194}.
%Y A114845 Cf. A001358, A113832, A113875, A115760, A164979.
%K A114845 nonn,more
%O A114845 1,1
%A A114845 _Jonathan Vos Post_, Feb 20 2006
%E A114845 More terms from _Zak Seidov_, Feb 21 2006
%E A114845 Corrected and extended by _Zak Seidov_, Sep 03 2009
%E A114845 a(11)-a(12) from _Amiram Eldar_, Jun 27 2024
%E A114845 a(13) from _Jinyuan Wang_, May 29 2025