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 A278287 #26 Dec 26 2016 10:22:56 %S A278287 1,1,1,0,1,2,1,1,1,0,1,2,1,1,2,1,1,3,2,2,4,2,1,2,1,1,2,1,1,2,1,1,3,2, %T A278287 2,3,1,2,3,1,3,5,2,2,5,2,1,4,3,2,4,3,2,4,3,2,5,3,2,5,3,1,6,3,2,4,4,2, %U A278287 4,4,3,4,3,2,5,2,2,6,2,2,6,1,2,4,1,2,4,2,1,5,3,3,5,2,3,6,3 %N A278287 Number of primes of the form 4k+3 such that 4(n - k) - 3 is 1 or prime where (4k+3)/3 >= n. %C A278287 Where 4(n - k) - 3 is a positive noncomposite number of the form 4m+1 (A280084). %e A278287 a(6) = 2 because 4*6 = 1 + 23 where (4*5+3)/3 = 23/3 > 6 and 4*6 = 5 + 19 where (4*4+3)/3 = 19/3 > 6. %Y A278287 Cf. A002144, A006005, A280084. %K A278287 nonn %O A278287 1,6 %A A278287 _Juri-Stepan Gerasimov_, Dec 24 2016