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 A320631 #5 Oct 18 2018 08:50:30
%S A320631 13,29,43,47,73,79,101,113,137,139,149,163,167,169,181,199,233,257,
%T A320631 269,271,293,313,317,347,349,373,377,389,397,421,439,443,449,467,487,
%U A320631 491,499,557,559,571,577,601,607,611,619,631,647,653,673,677,727,733,751
%N A320631 Products of odd primes of nonprime squarefree index.
%e A320631 The sequence of terms begins:
%e A320631 13 = prime(6)
%e A320631 29 = prime(10)
%e A320631 43 = prime(14)
%e A320631 47 = prime(15)
%e A320631 73 = prime(21)
%e A320631 79 = prime(22)
%e A320631 101 = prime(26)
%e A320631 113 = prime(30)
%e A320631 137 = prime(33)
%e A320631 139 = prime(34)
%e A320631 149 = prime(35)
%e A320631 163 = prime(38)
%e A320631 167 = prime(39)
%e A320631 169 = prime(6)^2
%e A320631 181 = prime(42)
%e A320631 199 = prime(46)
%e A320631 233 = prime(51)
%e A320631 257 = prime(55)
%e A320631 269 = prime(57)
%e A320631 271 = prime(58)
%e A320631 293 = prime(62)
%e A320631 313 = prime(65)
%e A320631 317 = prime(66)
%e A320631 347 = prime(69)
%e A320631 349 = prime(70)
%e A320631 373 = prime(74)
%e A320631 377 = prime(6)*prime(10)
%t A320631 Select[Range[1,100,2],With[{f=PrimePi/@First/@FactorInteger[#]},And[And@@SquareFreeQ/@f,And@@Not/@PrimeQ/@f]]&]
%Y A320631 Cf. A000040, A006450, A007821, A018252, A056239, A076610, A112798, A302242, A302478, A320628, A320629, A320630, A320633.
%K A320631 nonn
%O A320631 1,1
%A A320631 _Gus Wiseman_, Oct 18 2018