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 A181414 #17 Jun 28 2017 19:31:58
%S A181414 529,667,841,1357,1403,1541,1633,1711,1769,1817,1909,1943,2059,2291,
%T A181414 2407,2507,3161,3481,3599,3721,3953,4087,4189,4331,4489,4661,4757,
%U A181414 4819,4897,5041,5063,5293,5561,5609,5893,6241,6431,6557,6649,6889
%N A181414 Products of exactly two Pillai primes.
%C A181414 It would not be right to call these "Pillai semiprimes" as that would better describe semiprimes k such that there exists an integer m such that m!+1 is 0 mod k and k is not 1 mod m.
%C A181414 There are no pairs (n, n+1) in this sequence since all terms are odd. The first few n such that n and n+2 are in the sequence are 11771, 14099, 19337, 32729, 32741, 34829, 37391, 38249, 39467, 40319, 41747, ... - _Charles R Greathouse IV_, Jan 28 2011
%F A181414 {A063980(i) * A063980(j)}.
%e A181414 a(2) = 23*29.
%Y A181414 Cf. A001358, A063980.
%K A181414 nonn,easy
%O A181414 1,1
%A A181414 _Jonathan Vos Post_, Jan 28 2011