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 A103746 #5 Apr 04 2016 13:29:30 %S A103746 2,3,5,10,13,20,33,60,89,109,116,138,144,152,182,189,212,223,253,258, %T A103746 297,320,336,350,353,375,390,418,422,487,492,498,501,549,567,579,592, %U A103746 616,654,671,704,755,799,800,812,826,874,893,917,921,948,951,957,967 %N A103746 Numbers n such that prime(n)*prime(n+1) - 1 is semiprime. %H A103746 Ray Chandler, <a href="/A103746/b103746.txt">Table of n, a(n) for n = 1..10000</a> %e A103746 prime(10)*prime(11) - 1 = 29*31 - 1 = 898 = 2*449, hence 10 is a term. %o A103746 (PARI) for(n=1,1000,if(bigomega(prime(n)*prime(n+1)-1)==2,print1(n,","))) %Y A103746 Cf. A001358, A006881, A103533. %K A103746 nonn,easy %O A103746 1,1 %A A103746 _Klaus Brockhaus_, Mar 29 2005