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!)
A093612 Primes of form 7^n-2. 1
5, 47, 2399, 823541, 5764799, 13841287199, 4747561509941, 459986536544739960976799, 157775382034845806615042741, 97327453648743672783790144527749033795901408624680013074608083129650399 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The exponents n are listed in A090669, cf. formula. [From M. F. Hasler, Nov 26 2009]

The next term (a(11)) has 83 digits. - Harvey P. Dale, Nov 14 2014

LINKS

Table of n, a(n) for n=1..10.

FORMULA

a(n)=7^A090669(n)-2. [From M. F. Hasler, Nov 26 2009]

MATHEMATICA

Select[7^Range[90]-2, PrimeQ] (* Harvey P. Dale, Nov 14 2014 *)

CROSSREFS

Cf. A014232.

Sequence in context: A145564 A159480 A196460 * A069985 A300336 A086776

Adjacent sequences:  A093609 A093610 A093611 * A093613 A093614 A093615

KEYWORD

nonn

AUTHOR

Arnaud Vernier, May 23 2004

EXTENSIONS

Terms beyond a(6) from M. F. Hasler, Nov 26 2009

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 April 18 13:57 EDT 2021. Contains 343088 sequences. (Running on oeis4.)