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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A014659 Numbers n that are odd and do not divide 2^k + 1 for any k >= 1. 2
7, 15, 21, 23, 31, 35, 39, 45, 47, 49, 51, 55, 63, 69, 71, 73, 75, 77, 79, 85, 87, 89, 91, 93, 95, 103, 105, 111, 115, 117, 119, 123, 127, 133, 135, 141, 143, 147, 151, 153, 155, 159, 161, 165, 167, 175, 183, 187, 189, 191, 195, 199, 203, 207, 213, 215, 217, 219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This is the subset of odd integers >1 as (2*n - 1) in A179480 such that A179480(n) is even. Example: A179480(18) = 6, even; corresponding to (2*18 - 1), 35. Then 35 is in A014659. A014657 is the subset of odd terms >1 corresponding to odd terms in A179480. - Gary W. Adamson, Aug 20 2012

REFERENCES

P. Moree, Appendix to V. Pless et al., Cyclic Self-Dual Z_4 Codes, Finite Fields Applic., vol. 3 pp. 48-69, 1997.

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

CROSSREFS

Cf. A179480, A003558

Cf. A014657, numbers that divide 2^k + 1 for some k.

Sequence in context: A064397 A214467 A151971 * A179676 A053354 A274700

Adjacent sequences:  A014656 A014657 A014658 * A014660 A014661 A014662

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Don Reble, Nov 03 2001

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 October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)