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 A275508 #12 Jul 01 2022 19:37:59
%S A275508 1,9,14,33,54,201,140,2170,213,4529,10403,1934,35811,162144,38405,
%T A275508 414225,200938,389409,1792209,5606457,18493931,30947532,61190563,
%U A275508 8405437,203631499,577699919,158280474,68780189,4082994208,3944563444
%N A275508 First occurrence of a run of exactly n consecutive integers with an even number of prime factors.
%e A275508 a(3)=14 because 14 begins the first occurrence of a run of exactly 3 consecutive integers with an even number of prime factors, i.e., 14=2*7, 15=3*5, 16=2*2*2*2.
%t A275508 Join[{1},Table[SequencePosition[Table[If[EvenQ[PrimeOmega[n]],1,0],{n,5610000}],Join[ {0},PadRight[{},d,1],{0}],1],{d,2,20}][[All,1,1]]+1] (* The program generates the first 20 terms of the sequence. *) (* _Harvey P. Dale_, Jul 01 2022 *)
%o A275508 (PARI) v=vector(100); last=0; for(n=1,1e10, if(bigomega(n)%2, t=n-last-1; if(t && v[t]==0, v[t]=n-t; print(t" "n-t)); last=n)) \\ _Charles R Greathouse IV_, Jul 30 2016
%Y A275508 Cf. A005843, A066829.
%K A275508 nonn
%O A275508 1,2
%A A275508 _G. L. Honaker, Jr._, Jul 30 2016
%E A275508 a(11)-a(30) from _Charles R Greathouse IV_, Jul 30 2016