OFFSET
1,1
COMMENTS
Primes of the form k*10^(k+1) + 10^k - 1.
PROG
(PARI) lista(nn) = for(k=1, nn, if(ispseudoprime(q=k*10^(k+1)+10^k-1), print1(q, ", "))); \\ Jinyuan Wang, Mar 24 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Oct 21 2008
STATUS
approved