

A344424


Numbers k such that A344423(k) is prime.


1




OFFSET

1,1


COMMENTS

a(10) > 10000.  Hugo Pfoertner, May 19 2021


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

A344423(3) = 100111001 is prime, so 3 is a term of the sequence.


PROG

(PARI) is(n) = ispseudoprime(10^(2*n+2) + 111*10^n + 1)


CROSSREFS

Cf. A070247, A100580, A344423.
Sequence in context: A208631 A093164 A092448 * A045481 A275566 A068380
Adjacent sequences: A344421 A344422 A344423 * A344425 A344426 A344427


KEYWORD

nonn,hard,more


AUTHOR

Felix FrÃ¶hlich, May 18 2021


EXTENSIONS

a(9) from Hugo Pfoertner, May 19 2021


STATUS

approved



