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 A238737 #12 Mar 31 2014 15:50:03 %S A238737 0,1,1,1,3,1,1,3,1,1,3,1,3,5,1,1,3,5,1,3,1,1,3,1,3,5,1,3,5,1,1,3,5,1, %T A238737 3,1,1,3,5,1,3,1,3,5,1,3,5,7,1,3,1,1,3,1,1,3,1,3,5,7,9,11,13,1,3,1,3, %U A238737 5,1,1,3,5,7,9 %N A238737 a(n) = 2*n+2 - A224911(n). %C A238737 It appears that a(n+2) is successively either one 1 or a string of the odd numbers. %C A238737 Conjecture: the rank of 1's is A005097(n+1). This is another link between Bernoulli numbers and primes via A190339(n). %C A238737 Apparently (essentially) a duplicate of A049653. - _R. J. Mathar_, Mar 30 2014 %e A238737 a(0)=2-2=0, a(1)=4-3=1, a(2)=6-5=1, a(3)=8-7=1, a(4)=10-7=3. %Y A238737 Cf. A060308, A005408. %K A238737 nonn %O A238737 0,5 %A A238737 _Paul Curtz_, Mar 04 2014