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 A173101 #8 Aug 14 2019 08:33:31
%S A173101 22,10183133,10183331,10213223,10313317,10322123,10331831,10331931,
%T A173101 10333117,12183133,12183331,12193331,12311033,12311633,12311833,
%U A173101 12313318,12331031,12333115,12333119,14103331,14153331,14163133,14173133,14183133,14193331,14311533,14311633
%N A173101 Self-describing semiprimes.
%C A173101 This is to A001358 as A108810 is to A000040.
%H A173101 Giovanni Resta, <a href="/A173101/b173101.txt">Table of n, a(n) for n = 1..10000</a>
%F A173101 {A109776 INTERSECTION A001358}. a(n) = n-th integer k such that OMEGA(k)=2 where OMEGA(n) is the sum of the exponents in the prime decomposition of k, and reading the number (in base 10) in successive pairs of digits gives a (possibly redundant) description of the number.
%e A173101 a(1) = 22 because "22" does indeed consist of "two 2's" and 22 = 2 * 11 is semiprime. a(4) = 10213223 because 10213223 consists of one "0", two 1's, three 2's, and two 3's; and 10213223 = 41 * 249103 is semiprime.
%Y A173101 Cf. A001358, A108810, A109776.
%K A173101 nonn,base,fini,less
%O A173101 1,1
%A A173101 _Jonathan Vos Post_, Feb 09 2010
%E A173101 More terms from _Giovanni Resta_, Aug 14 2019