A204999 - OEIS

%I #12 Sep 29 2018 18:41:23

%S 3,4,1,2,1,2,1,1,1,2,1,1,1,2,1,1,1,4,1,1,1,2,1,1,3,2,1,1,1,2,1,1,1,2,

%T 1,2,1,2,1,1,1,2,1,1,1,2,1,1,3,4,1,1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,1,1,

%U 1,2,1,1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,1,1,1,4,1,2,1,2,1,1,1

%N a(n) = (1/n)*A204998(n).

%C For a guide to related sequences, see A204892.

%C Positions of 3's seem to be given by a subsequence of A104777. - _Antti Karttunen_, Sep 29 2018

%H Antti Karttunen, <a href="/A204999/b204999.txt">Table of n, a(n) for n = 1..23005</a>

%F a(n) = (A204996(n)-A204997(n))/n.

%t (See the program at A204994.)

%o (PARI) A204999(n) = { my(d); for(k=sqrtint(1+n), oo, for(j=1,k-1,if(!((d=(k^2)-(j^2))%n),return(d/n),if(d<n,break)))); }; \\ _Antti Karttunen_, Sep 28 2018

%Y Cf. A204996, A204997, A204998, A204892.

%K nonn

%O 1,1

%A _Clark Kimberling_, Jan 21 2012

%E More terms from _Antti Karttunen_, Sep 28 2018