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A062577 Numbers n such that 11^n - 10^n is prime. 6
3, 5, 19, 311, 317, 1129, 4253, 7699, 18199, 35153, 206081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms greater than 1000 may correspond to unproven strong pseudoprimes.

LINKS

Table of n, a(n) for n=1..11.

Top probable primes of the form 11^p-10^p

PROG

(PARI) is(n)=ispseudoprime(11^n-10^n) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572-A062666.

Sequence in context: A291920 A172058 A303937 * A144743 A171862 A231627

Adjacent sequences:  A062574 A062575 A062576 * A062578 A062579 A062580

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

EXTENSIONS

Two more terms 18199 and 35153 found by Jean-Louis Charton corresponding to probable primes with 18953 and 36609 digits. Jean-Louis Charton, Sep 02 2009

New term 206081 found by Jean-Louis Charton in October 2011 corresponding to a probable prime with 214612 digits

Edited by M. F. Hasler, Sep 16 2013

STATUS

approved

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Last modified May 19 16:42 EDT 2019. Contains 323395 sequences. (Running on oeis4.)