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 A128278 #2 Jul 12 2012 00:39:49 %S A128278 105,165,231,935,2109,2795,3021,3819,6981,7205,11285,12341,13101, %T A128278 16419,17549,19839,21749,21995,26391,31229,31269,46631,62651,63645, %U A128278 65391,76155,77585,100955,110811,113555,118031,136451,148359,150245,154679 %N A128278 an=n-th smallest integer m=p1*p2*p3, product of 3 odd primes such that d+2m/d are all primes for d dividing 2m. %e A128278 E.g. 105=3.5.7, 2.3.5.7+1=211, 2+3.5.7=107, 3+2.5.7=73, 5+2.3.7=47, 7+2.3.5=37, 2.3+5.7=41, 2.5+3.7=31, 2.7+3.5=29 are all primes and 3.5.7 is the smallest such number, so a(1)=105. %Y A128278 Cf. A128276, A128277, A128279, A045536. %K A128278 nonn %O A128278 1,1 %A A128278 Kok Seng Chua (chuakokseng(AT)hotmail.com), Mar 05 2007