OFFSET
1,3
COMMENTS
a(12), if it exists, is greater than 20000. - Vaclav Kotesovec, Mar 25 2018
a(12), if it exists, is greater than 80000. - Michael S. Branicky, Sep 03 2024
MATHEMATICA
Flatten[{0, Select[Range[1000], PrimeQ[5^# + 5*# + 1] &]}] (* Vaclav Kotesovec, Mar 25 2018 *)
PROG
(PARI) for(n=0, 500, if(isprime(5^n+5*n+1), print1(n", ")))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Mar 25 2018
EXTENSIONS
a(8)-a(11) from Vaclav Kotesovec, Mar 25 2018
STATUS
approved