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A216619
Numbers k such that 10^k + k^10 - 1 is prime.
1
2, 8, 1592, 2380
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OFFSET
1,1
COMMENTS
Next term > 10^4.
a(5) > 10^5. -
Robert Price
, Oct 08 2015
LINKS
Table of n, a(n) for n=1..4.
MATHEMATICA
Select[Range[0, 5000], PrimeQ[10^# + #^10 - 1] &]
PROG
(PARI) is(n)=ispseudoprime(10^n+n^10-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A100357
,
A215434
-
A215446
,
A216375
.
Sequence in context:
A014116
A027668
A121015
*
A306241
A073630
A027733
Adjacent sequences:
A216616
A216617
A216618
*
A216620
A216621
A216622
KEYWORD
nonn
,
hard
,
more
AUTHOR
Vincenzo Librandi
, Sep 11 2012
STATUS
approved
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Last modified April 19 15:11 EDT 2024. Contains 371794 sequences. (Running on oeis4.)