OFFSET
2,1
COMMENTS
For n > 9, a(n) exceeds primepi(10^10) = 455052511 or is -1.
Conjecture: a(n) is never -1.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Jon E. Schoenfield, Jul 02 2024
EXTENSIONS
a(10) from Michael S. Branicky, Jul 05 2024
STATUS
approved