OFFSET
1,1
COMMENTS
a(26) > 200000. - Robert Price, Jun 06 2020
PROG
(PARI) for(n=1, 10^4, if(ispseudoprime(10^n - 123456789), print1(n, ", ")))
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Derek Orr, Oct 05 2014
EXTENSIONS
a(21)-a(25) from Robert Price, Feb 26 2020
STATUS
approved