A064456 A064434(n) = 0.

1, 3, 79, 235, 431, 1503, 2943, 6059, 6619, 18911, 54223, 302467995, 1772665631, 2148845167, 5145362667, 129465909327, 212089391807

Offset: 1

Author

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

Keywords

• nonn
• more

Comments

a(18) > 4*10^12. - Donovan Johnson, Jan 19 2011

Also indices n where A079878(n)=1. - R. J. Mathar, Nov 13 2011

Crossrefs

Cf. A064433.

Programs

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;

Extensions

More terms from Klaus Brockhaus, Oct 04 2001

Offset corrected and a(15)-a(17) from Donovan Johnson, Jan 19 2011