

A145851


Primes of the form k followed by k 9's.


2




OFFSET

1,1


COMMENTS

Corresponding k, which cannot be multiples of 3, are in A174352. The next term has 176 digits, too large to include here.  Rick L. Shepherd, Mar 22 2010


LINKS

Table of n, a(n) for n=1..6.


MATHEMATICA

Select[Table[FromDigits[PadRight[{k}, k+1, 9]], {k, 200}], PrimeQ] (* Harvey P. Dale, Jun 22 2022 *)


PROG

(PARI) lista(nn) = for(k=1, nn, if(ispseudoprime(q=k*10^(k1)1), print1(q, ", "))); \\ Jinyuan Wang, Mar 24 2020


CROSSREFS

Cf. A141311, A145852.
Cf. A174352.  Rick L. Shepherd, Mar 22 2010
Sequence in context: A203703 A068734 A216529 * A182374 A034207 A098970
Adjacent sequences: A145848 A145849 A145850 * A145852 A145853 A145854


KEYWORD

nonn,base


AUTHOR

Lekraj Beedassy, Oct 21 2008


EXTENSIONS

a(2) was 4999; corrected by Rick L. Shepherd, Mar 22 2010


STATUS

approved



