|
%I #8 Mar 20 2017 23:21:30
%S 0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,
%T 0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,
%U 0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,0,0,1
%N a(1) = 0 and for n > 1, a(n) = 1 if Stern polynomial B(n,x) is irreducible, 0 otherwise.
%C Characteristic function for A186891 (apart from term 1, which is here defined as a(1) = 0).
%H Antti Karttunen, <a href="/A283991/b283991.txt">Table of n, a(n) for n = 1..65537</a>
%o (PARI)
%o \\ After _Charles R Greathouse IV_'s code for A186891.
%o ps(n) = if(n<2, n, if(n%2, ps(n\2)+ps(n\2+1), 'x*ps(n\2)));
%o A283991(n) = polisirreducible(ps(n));
%Y Cf. A186891, A125184, A260443.
%Y Cf. A283992 (partial sums).
%Y Differs from A010051 for the first time at n=25: here a(25) = 1.
%Y Differs from A257000 for the first time at n=65: here a(65) = 1.
%K nonn
%O 1
%A _Antti Karttunen_, Mar 20 2017
|
