A062577 Numbers k such that 11^k - 10^k is prime.

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

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 from Jean-Louis Charton, Sep 02 2009

New term 206081 found by Jean-Louis Charton in October 2011

Edited by M. F. Hasler, Sep 16 2013

Status

approved