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 A035004 #24 Nov 17 2021 15:56:58 %S A035004 1,3,4,4,3,4,6,4,4,5,6,6,4,4,8,3,4,4,6,8,6,4,4,4,9,4,4,8,8,6,6,4,10,3, %T A035004 6,4,6,8,4,8,4,4,12,4,6,7,4,8,6,4,8,12,4,6,6,4,8,10,5,4,12,4,4,4,8,12, %U A035004 4,6,4,4,4,12,6,6,9,8,8,8,4,12,8,4,10,8,4,6,6,4,4,16,3,4,4,6,4,12,8,4 %N A035004 Number of divisors of the n-th nonprime. %C A035004 a(n+1) = a(n) only when a(n) is even. Will these repeat terms include each even integer >= 4? (See also A075036.) - _Bill McEachen_, Nov 16 2021 %H A035004 Harvey P. Dale, <a href="/A035004/b035004.txt">Table of n, a(n) for n = 1..1000</a> %F A035004 a(n) = A000005(A018252(n)). - _Omar E. Pol_, Jan 31 2013 %t A035004 DivisorSigma[0,Select[Range[200],!PrimeQ[#]&]] (* _Harvey P. Dale_, Mar 07 2016 *) %o A035004 (PARI) for(n=1,33, if(!isprime(n), print1(numdiv(n), ", "))) \\ edited by _Michel Marcus_, Jan 04 2016 %Y A035004 Cf. A000005, A002808, A018252, A075036. %K A035004 easy,nonn %O A035004 1,2 %A A035004 _Jason Earls_, Jul 05 2001 %E A035004 More terms from _Lior Manor_, Aug 16 2001