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A062585 Numbers n such that 19^n - 18^n is prime. 4
2, 1607, 1873, 10957 (list; graph; refs; listen; history; text; internal format)
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 pseudo-primes 19^n - 18^n. [M. F. Hasler, Sep 16 2013]

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572-A062583, A188051, A062586-A062666.

Sequence in context: A110027 A179866 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 was found by Mike Oakes in 2003. - Alexander Adamchuk, Feb 16 2007

STATUS

approved

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Last modified October 30 19:42 EDT 2014. Contains 248837 sequences.