A224470 Numbers k such that 7^k - k is prime.
2, 6, 8, 12, 44, 48, 512, 1088, 1104, 6038
Offset: 1
Programs
-
PARI
forstep(n=2,10^4,2,if(ispseudoprime(7^n-n),print1(n,", "))); /* Joerg Arndt, Apr 07 2013 */
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
forstep(n=2,10^4,2,if(ispseudoprime(7^n-n),print1(n,", "))); /* Joerg Arndt, Apr 07 2013 */
Comments