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 A176363 #13 Jul 23 2024 15:04:15 %S A176363 1,2,3,7,11,12,17,18,19,24,27,28,29,30,36,37,42,43,44,45,47,48,54,56, %T A176363 61,63,64,66,67,68,71,72,75,78,79,80,83,89,90,92,97,98,100,101,102, %U A176363 104,105,107,108,110,112,114,116,117,120,125,126,131,132,135,137,144,147,148 %N A176363 Non-semiprime numbers of order 2. %C A176363 Non-semiprimes with non-semiprime subscripts (or indices). %H A176363 Chai Wah Wu, <a href="/A176363/b176363.txt">Table of n, a(n) for n = 1..10000</a> %F A176363 a(n) = A100959(A100959(n)). %p A176363 A100959 := proc(n) option remember; if n = 1 then 1; else for a from procname(n-1)+1 do if numtheory[bigomega](a) <> 2 then return a; end if; end do end if; end proc: A176363 := proc(n) A100959(A100959(n)) ; end proc: seq(A176363(n),n=1..80) ; # _R. J. Mathar_, Apr 25 2010 %K A176363 nonn %O A176363 1,2 %A A176363 _Juri-Stepan Gerasimov_, Apr 16 2010 %E A176363 Corrected (66 inserted) _R. J. Mathar_, Apr 25 2010