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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067904 Primes of the form floor((3/2)^k). 4
2, 3, 5, 7, 11, 17, 4987, 7481, 180693856682317883, 4630985912862061063, 75677449184722757264165738713, 1910944005427272291238064043761449, 366425537175409658704814112327931286021 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, E19.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..23

MATHEMATICA

f[n_]:=Floor[(3/2)^n]; lst={}; Do[p=f[n]; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 4*5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jul 02 2009 *)

Select[Floor[(3/2)^Range[300]], PrimeQ] (* Harvey P. Dale, Dec 28 2014 *)

PROG

(PARI) v=[]; for(k=2, 5700, if(ispseudoprime(t=floor((3/2)^k)), v=concat(v, t))); v \\ Charles R Greathouse IV, Feb 15 2011

CROSSREFS

Cf. A043037, A070758, A070759.

Sequence in context: A038887 A178991 A240566 * A018146 A293637 A284250

Adjacent sequences:  A067901 A067902 A067903 * A067905 A067906 A067907

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 03 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 November 18 22:39 EST 2019. Contains 329305 sequences. (Running on oeis4.)