OFFSET
1,2
COMMENTS
Numbers corresponding to terms <= 767 are certified primes. - Klaus Brockhaus, Feb 16 2005
The next term is larger than 2500. - Stefan Steinerberger, Feb 18 2006
MATHEMATICA
For[n=1, n<2500, n++, If[PrimeQ[4*10^n-11], Print[n]]] (* Stefan Steinerberger, Feb 18 2006 *)
PROG
(PARI) is(n)=ispseudoprime(4*10^n-11) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Tom Mueller (muel4503(AT)uni-trier.de), Feb 08 2005
EXTENSIONS
a(9)-a(14) from Klaus Brockhaus, Feb 16 2005
a(15) from Ryan Propper, Jul 21 2006
a(16)-a(17) from Michael S. Branicky, May 01 2023
a(18)-a(23) from Kamada data by Tyler Busby, May 03 2024
STATUS
approved