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 A033766 #16 Dec 12 2019 03:27:29 %S A033766 1,1,2,3,6,8,11,20,29,47,78,129,230,400,710,1221 %N A033766 Number of prime divisors (counted without multiplicity) of A138613(n). %C A033766 The old entry with this sequence number was a duplicate of A035162. %t A033766 PrimeNu[NestList[DivisorSigma[2,#]&,2,12]] (* _Harvey P. Dale_, Aug 19 2017 *) %Y A033766 Cf. A138613, A079488, A001221. %K A033766 nonn,more %O A033766 1,3 %A A033766 _N. J. A. Sloane_, Sep 20 2008 %E A033766 a(10)-a(12) from _Donovan Johnson_, Nov 17 2008 %E A033766 a(13)-a(16) from _Daniel Suteu_, Dec 11 2019