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A344424 Numbers k such that A344423(k) is prime. 1
3, 54, 58, 64, 70, 253, 438, 4255, 8770 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(10) > 10000. - Hugo Pfoertner, May 19 2021
LINKS
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
Sequence in context: A208631 A093164 A092448 * A045481 A275566 A068380
KEYWORD
nonn,hard,more
AUTHOR
Felix Fröhlich, May 18 2021
EXTENSIONS
a(9) from Hugo Pfoertner, May 19 2021
STATUS
approved

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Last modified April 14 05:31 EDT 2024. Contains 371655 sequences. (Running on oeis4.)