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 A281824 #11 Dec 08 2017 18:28:34 %S A281824 58,75,91,107,123,142,161,175,191,205,225,241,258,278,297,316,332,348, %T A281824 366,385,405,429,452,473,491,508,524,536,546,566,590,614,639,664,690, %U A281824 706,718,732,747,762,782,802,822,838,851,872,889,906,924,945,968,990 %N A281824 Numbers that are the sum of 6 consecutive semiprimes. %C A281824 Semiprime analog of A127333. First terms that are also in A127333: 690, 990, 1172, 1250, 1286, 2288, 4798, 5064. %H A281824 Charles R Greathouse IV, <a href="/A281824/b281824.txt">Table of n, a(n) for n = 1..10000</a> %F A281824 a(n) ~ 6n log n/log log n. - _Charles R Greathouse IV_, Jan 31 2017 %t A281824 Total /@ Partition[Select[Range[4, 200], 2 == PrimeOmega[#] &], 6, 1] %o A281824 (PARI) do(n)=my(v=List([58]),u=List(),t=58); forprime(p=2,n\2, forprime(q=2,min(p,n\p), listput(u,p*q))); u=Set(u); for(i=7,#u, listput(v, t+=u[i]-u[i-6])); Set(v) \\ _Charles R Greathouse IV_, Jan 31 2017 %Y A281824 Cf. A001358, A127333. %K A281824 nonn %O A281824 1,1 %A A281824 _Zak Seidov_, Jan 31 2017