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A062585
Numbers k such that 19^k  18^k is prime.
4
2, 1607, 1873, 10957
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OFFSET
1,1
COMMENTS
PrimePi[ a(n) ] = {2, 253, 287, 1331, ...}. 
Alexander Adamchuk
, Feb 16 2007
a(5) > 10^5. 
Robert Price
, Jun 05 2012
Terms greater than 1000 may correspond to (unproven) strong pseudoprimes. 
M. F. Hasler
, Sep 16 2013
LINKS
Table of n, a(n) for n=1..4.
PROG
(PARI) is(n)=ispseudoprime(19^n18^n) \\
Charles R Greathouse IV
, Feb 20 2017
CROSSREFS
Cf.
A000043
,
A057468
,
A059801
,
A059802
,
A062572

A062583
,
A188051
,
A062586

A062666
.
Sequence in context:
A296362
A282999
A201242
*
A239505
A002490
A179961
Adjacent sequences:
A062582
A062583
A062584
*
A062586
A062587
A062588
KEYWORD
nonn
,
hard
AUTHOR
Mike Oakes
, May 18 2001, May 19 2001
EXTENSIONS
10957 (found by
Mike Oakes
in 2003) from
Alexander Adamchuk
, Feb 16 2007
STATUS
approved
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Last modified June 6 05:06 EDT 2023. Contains 363139 sequences. (Running on oeis4.)