login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082817 Triangle (with distinct entries) read by rows in which row n contains n numbers whose product == -1 (mod n). 5
1, 3, 5, 2, 4, 7, 9, 11, 13, 17, 6, 8, 12, 14, 16, 19, 23, 25, 29, 31, 35, 10, 15, 18, 20, 22, 24, 36, 21, 27, 33, 37, 39, 41, 43, 49, 26, 28, 32, 34, 38, 40, 44, 46, 53, 47, 51, 57, 59, 61, 63, 67, 69, 71, 81, 30, 42, 45, 48, 50, 52, 54, 56, 58, 60, 65, 55, 73, 77, 79, 83, 85 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Obviously all members of the n-th group are coprime to n.

LINKS

Table of n, a(n) for n=1..72.

EXAMPLE

1

3 5

2 4 7

9 11 13 17

6 8 12 14 16

...

PROG

(PARI) used = vector(1000); print(1); for (n = 2, 15, rowProd = 1; x = 2; for (k = 1, n - 1, while (used[x] || gcd(x, n) > 1, x = x + 1); print1(x); print1(" "); used[x] = 1; rowProd = rowProd*x; x = x + 1); while (used[x] || rowProd*x%n != n - 1, x = x + 1); print(x); used[x] = 1);

CROSSREFS

Cf. A082818, A082819, A082820, A082821.

Sequence in context: A219249 A203553 A081964 * A084753 A163364 A082822

Adjacent sequences:  A082814 A082815 A082816 * A082818 A082819 A082820

KEYWORD

nonn,tabl

AUTHOR

Amarnath Murthy, Apr 22 2003

EXTENSIONS

More terms from David Wasserman, Oct 05 2004

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)