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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

Table of n, a(n) for n=1..94.

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

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)