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A064456 A064434(n) = 0. 2
1, 3, 79, 235, 431, 1503, 2943, 6059, 6619, 18911, 54223, 302467995, 1772665631, 2148845167, 5145362667, 129465909327, 212089391807 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

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

LINKS

Table of n, a(n) for n=1..17.

PROG

(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;

CROSSREFS

Cf. A064433.

Sequence in context: A069839 A222192 A236069 * A073176 A236574 A062660

Adjacent sequences:  A064453 A064454 A064455 * A064457 A064458 A064459

KEYWORD

nonn,more

AUTHOR

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

EXTENSIONS

More terms from Klaus Brockhaus, Oct 04 2001

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

STATUS

approved

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Last modified August 5 14:57 EDT 2021. Contains 346469 sequences. (Running on oeis4.)