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 A255305 #14 Feb 23 2015 00:31:50
%S A255305 6,23,299,3439,51637,894211
%N A255305 The largest number that cannot be written as a sum of squarefree numbers that are the product of n primes.
%e A255305 a(1)=6 because each number that is 7 or larger can be written as the sum of distinct primes.
%e A255305 a(2)=23 because the squarefree numbers less than or equal to 23 that are the product of two primes are {6, 10, 14, 15, 21, 22} and there is no way to add some subset of these together to get 23; on the other hand every number greater than 23 can be so represented, i.e., 24=10+14, 25=10+15, 26=26, 27=6+21, 28=6+22, 30=6+10+14, and so on.
%K A255305 nonn,more
%O A255305 1,1
%A A255305 _Steve Butler_, Feb 20 2015