A070173 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A070173

Numbers k such that k! and 2^k+1 are relatively prime.

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

Amiram Eldar, Table of n, a(n) for n = 1..3000

MATHEMATICA

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

PROG

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

CROSSREFS

Cf. A000051, A000142, A069180.

Sequence in context: A181824 A326677 A330684 * A363122 A116882 A069519

Adjacent sequences: A070170 A070171 A070172 * A070174 A070175 A070176

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 06 2002

STATUS

approved