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A128448 Numbers n such that 8^n - n^8 is prime. 9
1, 11, 89, 201, 977, 1351, 3869 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

From the Lifchitz link: 60681 and 85349 are also in this sequence. - Robert Price, Mar 27 2019

LINKS

Table of n, a(n) for n=1..7.

Henri Lifchitz and Renaud Lifchitz, PRP Records.

MATHEMATICA

lst={}; k=8; Do[If[PrimeQ[Abs[k^n-n^k]], AppendTo[lst, n]], {n, 0, 10^4}]; lst (* Vladimir Joseph Stephan Orlovsky, Sep 10 2008 *)

PROG

(PARI) is(n)=isprime(8^n-n^8) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Cf. A072180, A109387, A117705, A117706, A128447, A128449, A128450, A128451, A122003, A128453, A128454.

Sequence in context: A162576 A142166 A140719 * A121155 A201117 A081657

Adjacent sequences:  A128445 A128446 A128447 * A128449 A128450 A128451

KEYWORD

hard,more,nonn

AUTHOR

Alexander Adamchuk, Mar 03 2007

EXTENSIONS

Two more terms from Donovan Johnson, Feb 26 2008

STATUS

approved

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Last modified August 9 04:30 EDT 2020. Contains 336319 sequences. (Running on oeis4.)