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 A091237 #10 Jan 11 2025 11:35:24
%S A091237 1,1,1,2,2,2,1,1,2,2,1,1,1,2,1,2,3,2,2,2,1,1,1,1,1,2,1,1,1,1,2,4,2,1,
%T A091237 1,1,1,1,1,1,2,1,1,2,2,1,1,1,2,2,1,2,4,1,1,1,1,2,3,7,2,1,1,1,1,1,1,1,
%U A091237 1,1,1,1,1,1,2,2,1,2,1,1,3,2,2,2,1,3,4
%N A091237 Lengths of runs in A039702.
%C A091237 Lengths of runs, where a run is a succession of primes that are congruent mod 4.
%C A091237 In other words, RUNS transform of A039702. If the two initial 1's are omitted, this is the RUNS transform of A100672. - _N. J. A. Sloane_, Jan 11 2025
%H A091237 T. D. Noe, <a href="/A091237/b091237.txt">Table of n, a(n) for n = 1..10000</a>
%t A091237 Most[Length /@ Split[Table[Mod[Prime[n], 4], {n, 200}]]] (* _T. D. Noe_, Sep 21 2012 *)
%Y A091237 Cf. A039702, A091318, A091267, A100672.
%K A091237 nonn,easy
%O A091237 1,4
%A A091237 _N. J. A. Sloane_, Feb 22 2004
%E A091237 More terms from _David Wasserman_, Feb 28 2006