A137236 Numbers k such that 13^k + 4 is prime.

0, 1, 2, 6, 10, 15, 94, 198, 219, 4543, 11511, 12638, 45606

Offset: 1

Author

Jason Earls, Mar 08 2008

Keywords

• hard
• more
• nonn

Comments

a(14) > 10^5. - Tyler NeSmith, May 09 2021

Links

• Henri Lifchitz and Renaud Lifchitz, PRP Records.

Programs

PARI

for(n=0,300,if(isprime(13^n+4),print1(n",")))

Extensions

a(13) from Lelio R. Paula contributed by Iain Fox, Nov 24 2017