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!)
A070173 n! and 2^n+1 are relatively prime. 0
1, 2, 4, 8, 12, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 128, 136, 144, 152, 160, 176, 184, 192, 200, 208, 224, 232, 248, 256, 272, 288, 304, 320, 352, 368, 384, 400, 416, 448, 464, 480, 496, 512, 544, 576, 592, 608, 640, 656, 688, 704, 752, 768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

MATHEMATICA

Select[Range[1000], CoprimeQ[#!, 2^#+1]&]

PROG

(PARI) for(n=1, 1255, if(gcd(n!, 2^n+1)==1, print1(n, ", ")))

CROSSREFS

Cf. A069180.

Sequence in context: A181824 A326677 A330684 * A116882 A069519 A087980

Adjacent sequences:  A070170 A070171 A070172 * A070174 A070175 A070176

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 06 2002

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 May 6 12:09 EDT 2021. Contains 343582 sequences. (Running on oeis4.)