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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217135 Numbers n such that 3^n - 8 is prime. 17
3, 4, 7, 8, 14, 20, 22, 62, 139, 254, 272, 430, 907, 1906, 2278, 2827, 3598, 6812, 15266, 20915, 26180, 26342, 27022, 48275, 65186, 69247, 86647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(28) > 2*10^5. - Robert Price, Sep 02 2013

LINKS

Table of n, a(n) for n=1..27.

MATHEMATICA

Select[Range[2, 5000], PrimeQ[3^# - 8] &]

PROG

(PARI) for(n=2, 5*10^3, if(isprime(3^n-8), print1(n", ")))

CROSSREFS

Cf. A014224, A051783, A058958, A058959.

Sequence in context: A114210 A073271 A117471 * A323247 A285662 A112062

Adjacent sequences:  A217132 A217133 A217134 * A217136 A217137 A217138

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Oct 01 2012

EXTENSIONS

a(18)-a(27) from Robert Price, Sep 02 2013

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 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)