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 A036327 #11 Feb 21 2019 23:16:28 %S A036327 8,12,18,20,22,26,27,28,30,33,34,38,39,42,45,46,50,51,55,57,58,62,63, %T A036327 65,69,70,74,75,77,82,85,86,87,91,93,94,95,98,105,106,111,115,118,119, %U A036327 122,123,125,129,133,134,141,142,145,146,147,155,158,159,161,166,175 %N A036327 Composite numbers n such that juxtaposition of prime factors of n has length 3. %C A036327 The last term is a(104)=679. %H A036327 Nathaniel Johnston, <a href="/A036327/b036327.txt">Table of n, a(n) for n = 1..104</a> (full sequence) %p A036327 isA036327 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=3, n, NULL): end: seq(isA036327(n),n=2..999); # _Nathaniel Johnston_, Jun 22 2011 %Y A036327 Cf. A036326-A036334. %K A036327 nonn,base,easy,fini,full %O A036327 1,1 %A A036327 _Patrick De Geest_, Dec 15 1998