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 A145031 #4 Mar 30 2012 17:35:01 %S A145031 5,9,45,81,675,1215,14175,28431,72171,597051,2679075,885735,10333575, %T A145031 89813529,286446699,390609135,789189885,7274895849,55142849601, %U A145031 204945438681,154580775111,1049522104701,596240132571,1307544150375 %N A145031 Smallest odd n-almost prime m such that m-2 and m+2 are both prime (cousin primes). %H A145031 Donovan Johnson, <a href="/A145031/b145031.txt">Table of n, a(n) for n=1..203</a> %e A145031 a(5) = 675 = 3^3*5^2 is a 5-almost prime and 675-2 and 675+2 are both prime (cousin primes). 675 is the smallest such 5-almost prime. %Y A145031 Cf. A023200, A046132, A068525. %K A145031 nonn %O A145031 1,1 %A A145031 _Donovan Johnson_, Sep 30 2008