OFFSET
1,1
COMMENTS
No other terms < 10000.
EXAMPLE
For n=2, 11311 is prime.
For n=3, 1013101 is not prime.
For n=4, 100131001 is prime.
PROG
(PARI) isok(n)=isprime(1+131*10^(n-1)+100^n) \\ Anders Hellström, Aug 20 2015
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Chai Wah Wu, Aug 20 2015
STATUS
approved