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A224506
Numbers k such that 9^k - k is prime.
0
2, 70, 88, 6562, 9100, 11758, 34334, 39212, 120590
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OFFSET
1,1
COMMENTS
a(7) > 20000. -
Giovanni Resta
, Apr 09 2013
a(10) > 2*10^5. -
Robert Price
, Mar 12 2014
LINKS
Table of n, a(n) for n=1..9.
MATHEMATICA
Select[Range[1000], PrimeQ[9^# - #] &] (*
Alonso del Arte
, Apr 11 2013 *)
PROG
(PARI) is(n)=ispseudoprime(9^n-n) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A048744
,
A058037
,
A057908
,
A058046
,
A058829
,
A224470
,
A224471
.
Sequence in context:
A041577
A180085
A321244
*
A085915
A285217
A259317
Adjacent sequences:
A224503
A224504
A224505
*
A224507
A224508
A224509
KEYWORD
nonn
,
more
AUTHOR
Alex Ratushnyak
, Apr 08 2013
EXTENSIONS
a(6) from
Giovanni Resta
, Apr 09 2013
a(7)-a(9) from
Robert Price
, Mar 12 2014
STATUS
approved
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Last modified April 17 21:22 EDT 2024. Contains 371767 sequences. (Running on oeis4.)