A062620 Numbers k such that 54^k - 53^k is prime.

2, 479, 1129, 2549, 11003

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms greater than 1000 often correspond only to strong probable primes.

a(6) > 10^5. - Robert Price, Feb 18 2013

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(54^n-53^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(5) = 11003 found by Mike Oakes in Aug 2003. - Jean-Louis Charton, Aug 15 2012