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 A321788 #27 Jul 03 2020 14:55:05
%S A321788 2,2,3,2,2,3,3,11,5,12,11,12,5,12,13,22,7,13,11,13,22,21,13,23,22,11,
%T A321788 21,15,22,23,13,31,22,15,22,33,23,22,17,111,21,31,33,17,22,33,21,111,
%U A321788 25,22,31,22,33,23,22,113,33,22,31,35,111,22,33,101,27,41,102,111,31,102,43,31,102,33,113,112,45
%N A321788 Product of semiprime factors using lunar arithmetic.
%H A321788 Metin Sariyar, <a href="/A321788/b321788.txt">Table of n, a(n) for n = 1..10000</a>
%H A321788 D. Applegate, M. LeBrun and N. J. A. Sloane, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL14/Sloane/carry2.html">Dismal Arithmetic</a>, Journal of Integer Sequences, Vol. 14 (2011), Article 11.9.8. [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]
%H A321788 Caldwell and Honaker, <a href="https://primes.utm.edu/curios/page.php?curio_id=33738">Prime Curio for 58</a>.
%F A321788 a(n) = A087062(A084126(n), A084127(n)). - _Michel Marcus_, Nov 20 2018
%e A321788 a(16)=22 because the 16th semiprime is 46 = 2*23. In lunar arithmetic the product becomes 22.
%t A321788 ladd[x_, y_] := FromDigits[MapThread[Max, IntegerDigits[#, 10, Max@ IntegerLength [{x, y}]] & /@ {x, y}]]; lmult[x_, y_] := Fold[ladd, 0, Table[10^i, {i, IntegerLength[y] - 1, 0, -1}]*FromDigits /@ Transpose@Partition[Min[##] & @@@ Tuples[IntegerDigits[{x, y}]], IntegerLength[y]]]; s={}; Do[If[PrimeOmega[n]==2, f=FactorInteger[n]; x=f[[1,1]]; y=n/x; m=lmult[x,y]; AppendTo[s, m]],{n,1,300}]; s (* _Amiram Eldar_, Nov 19 2018 after _Davin Park_ at A087062 *)
%Y A321788 Cf. A001358, A087062, A084126, A084127.
%K A321788 nonn,base
%O A321788 1,1
%A A321788 _G. L. Honaker, Jr._, Nov 18 2018