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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100867 Smallest positive integer k such that A000037(n) is not a quadratic residue modulo k. 1
3, 4, 3, 4, 4, 3, 4, 3, 5, 5, 3, 4, 3, 4, 4, 3, 8, 4, 3, 7, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 5, 3, 4, 7, 3, 4, 4, 3, 7, 4, 3, 5, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 9, 7, 3, 4, 3, 4, 4, 3, 7, 4, 3, 5, 5, 3, 4, 7, 3, 4, 4, 3, 4, 3, 9, 8, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 7, 5, 3, 4, 3, 4, 4, 3, 9, 4, 3, 5, 8, 3, 4, 5, 3, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The nonzero terms of A139401.

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = A139401(A000037(n)).

EXAMPLE

a(1) = 3 because the first nonsquare positive integer is 2 and 2 is not a quadratic residue modulo 3.

CROSSREFS

Sequence in context: A046536 A052384 A276867 * A220196 A128200 A258168

Adjacent sequences:  A100864 A100865 A100866 * A100868 A100869 A100870

KEYWORD

nonn

AUTHOR

Guilherme de Queiroz Hobbs (guilhermehobbs(AT)uol.com.br), Jan 08 2005

EXTENSIONS

Corrected and extended by David Wasserman, Mar 04 2008

Edited by Max Alekseyev, May 11 2010

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 September 27 18:40 EDT 2020. Contains 337386 sequences. (Running on oeis4.)