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 A128276 #4 Mar 30 2012 17:22:46 %S A128276 3,15,105,93081 %N A128276 a(n) is the least product of n odd primes m=p1*p2*...*pn, such that for all divisor d|2*m, d+2*m/d is prime. %C A128276 1. a(5) > 2*10^9 2. (C. Pomerance) The prime k-tuple conjecture implies a(n) exists for all n %e A128276 105=3*5*7 and 2*3*5*7+1, 3*5*7+2, 2*5*7+3, 2*3*7+5, 2*3*5+7, 2*3+5*7, 2*5+3*7, 2*7+3*5 are all primes and 105 is the smallest such integer which is the product of 3 odd primes, so a(3)=105 %K A128276 hard,more,nonn %O A128276 1,1 %A A128276 Kok Seng Chua (chuakokseng(AT)hotmail.com), Feb 23 2007 %E A128276 Typo in a(4) corrected by _T. D. Noe_, Aug 04 2010