

A062577


Numbers n such that 11^n  10^n is prime.


6



3, 5, 19, 311, 317, 1129, 4253, 7699, 18199, 35153, 206081
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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^p10^p


PROG

(PARI) is(n)=ispseudoprime(11^n10^n) \\ Charles R Greathouse IV, Feb 17 2017


CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572A062666.
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 JeanLouis Charton corresponding to probable primes with 18953 and 36609 digits. JeanLouis Charton, Sep 02 2009
New term 206081 found by JeanLouis Charton in October 2011 corresponding to a probable prime with 214612 digits
Edited by M. F. Hasler, Sep 16 2013


STATUS

approved



