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 A108635 #6 Dec 13 2015 01:02:16 %S A108635 4,6,9,10,21,22,33,51,55,62,65,74,77,82,85,86,87,91,93,94,95,111,221, %T A108635 321,411,422,511,533,542,543,551,553,554,611,622,633,655,662,721,731, %U A108635 753,755,763,766,771,831,841,842,843,851,862,865,866,871,886,921,922 %N A108635 Semiprimes with property that digits are in nonincreasing order. %e A108635 The semiprime 14 is missing because 4 > 1. %t A108635 Select[Range[1000], Plus@@Last/@FactorInteger[ # ]\[Equal]2&&OrderedQ[Reverse[IntegerDigits[ # ]]]&] %Y A108635 Cf. A108634. %K A108635 nonn,base,easy,less %O A108635 1,1 %A A108635 _Zak Seidov_, Jun 14 2005