A147670 Primes of the form 8^k-7^k.

1273609, 6612607849, 2019169299698041, 151522599154859354635552921, 9745744932248196392577951049, 220850092209355591999793321040563526382178219220559368038951319096656329

Offset

1,1

Comments

The next term (a(7)) has 103 digits. - Harvey P. Dale, Jul 05 2023

Links

Table of n, a(n) for n=1..6.

Example

8^7-7^7 = 2097152-823543 = 1273609.

Mathematica

lst={}; Do[p=8^n-7^n; If[PrimeQ[p], AppendTo[lst, p]], {n, 6!}]; lst
Select[Table[8^n-7^n, {n, 100}], PrimeQ] (* Harvey P. Dale, Jul 05 2023 *)

Crossrefs

Cf. A016177, A062574.

Sequence in context: A254019 A254893 A232203 * A392077 A204397 A058894

Adjacent sequences: A147667 A147668 A147669 * A147671 A147672 A147673

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Nov 10 2008

Status

approved