The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A131879 Triangle where row n contains the first n positive integers which are coprime to (2^n -1). 2
 1, 1, 2, 1, 2, 3, 1, 2, 4, 7, 1, 2, 3, 4, 5, 1, 2, 4, 5, 8, 10, 1, 2, 3, 4, 5, 6, 7, 1, 2, 4, 7, 8, 11, 13, 14, 1, 2, 3, 4, 5, 6, 8, 9, 10, 1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 4, 8, 11, 16, 17, 19, 22, 23, 29, 31, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 4 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE 2^6 -1 = 63. So row 6 is the first 6 positive integers which are coprime to 63: (1,2,4,5,8,10). CROSSREFS Cf. A131880, A000225. Sequence in context: A208515 A286880 A178030 * A172288 A134628 A064882 Adjacent sequences:  A131876 A131877 A131878 * A131880 A131881 A131882 KEYWORD nonn,tabl AUTHOR Leroy Quet, Jul 23 2007 EXTENSIONS More terms from R. J. Mathar, Aug 01 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 16 06:04 EST 2021. Contains 340195 sequences. (Running on oeis4.)