%I #13 Dec 16 2019 01:57:15

%S 1,3,79,235,431,1503,2943,6059,6619,18911,54223,302467995,1772665631,

%T 2148845167,5145362667,129465909327,212089391807

%N A064434(n) = 0.

%C a(18) > 4*10^12. - _Donovan Johnson_, Jan 19 2011

%C Also indices n where A079878(n)=1. - _R. J. Mathar_, Nov 13 2011

%o (ARIBAS): a := 0; for n := 1 to 3000000000 do am := a; a := (am*2 + 1) mod n; if a = 0 then write(n," "); end; end;

%Y Cf. A064433.

%K nonn,more

%O 1,2

%A Jonathan Ayres (JonathanAyres(AT)btinternet.com), Oct 01 2001

%E More terms from _Klaus Brockhaus_, Oct 04 2001

%E Offset corrected and a(15)-a(17) from _Donovan Johnson_, Jan 19 2011