OFFSET
1,2
COMMENTS
Besides 1, numbers k such that A241018(k) = 0.
LINKS
Robert Israel, Table of n, a(n) for n = 1..577
EXAMPLE
a(2) = 9 is a term because none of the numbers 199999999, 9199999999, ..., 999999991 are prime.
MAPLE
filter:= proc(n) local a, j;
a:= 10^n-1;
not ormap(j -> isprime(a-8*10^j), [$0..n-1])
end proc:
select(filter, [$1..400]);
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Robert Israel, Jun 01 2024
STATUS
approved