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 A128286 #9 Dec 12 2021 22:57:34 %S A128286 884037,1137565,2398377,123156993,681714273,2347722213,7283144845, %T A128286 7794246057,8953447917,10287992785,13749228493,38108016453, %U A128286 38901676405,70918253385,71809744693,120418624965,148282565865,150721729873 %N A128286 a(n) is the n-th smallest product of 5 odd primes m = p1*p2*p3*p4*p5 such that (d+m/d)/2 are all primes for each d dividing m. %C A128286 a(6) > 10^9. %e A128286 884037 = 3*7*11*43*89 and (1 + 884037)/2, (3 + 7*11*43*89)/2, %e A128286 (7 + 3*11*43*89)/2, (11 + 3*7*43*89)/2, (43 + 3*7*11*89)/2, (89 + 3*7*11*43)/2, %e A128286 (3*7 + 11*43*89)/2, (3*11 + 7*43*89)/2, (3*43 + 7*11*89)/2,(3*89 + 7*11*43)/2, %e A128286 (7*11 + 3*43*89)/2, (7*43 + 3*7*89)/2, (7*89 + 3*7*43)/2, (11*43 + 3*7*89)/2, %e A128286 (11*89 + 3*7*43)/2, (43*89 + 3*7*11)/2 are all primes and 884037 is the smallest such integer, so a(1) = 884037. %Y A128286 Cf. A128281, A005383, A128283, A128284, A128285. %K A128286 hard,nonn %O A128286 1,1 %A A128286 Kok Seng Chua (chuakokseng(AT)hotmail.com), Mar 05 2007 %E A128286 a(6)-a(18) from _Donovan Johnson_, Oct 12 2008