Numbers k such that 11^(k+7) + 7^(k+5) + 5^(k+3) + 3^(k+2) + 2^(k+1) + 1 is prime.
A306573
Numbers k such that 11^(k+7) + 7^(k+5) + 5^(k+3) + 3^(k+2) + 2^(k+1) + 1 is prime.
Terms
- a(0) =3a(1) =5a(2) =7a(3) =81a(4) =185a(5) =254a(6) =623a(7) =1087a(8) =2407a(9) =7862a(10) =8721a(11) =9353a(12) =13154a(13) =63003
External references
- oeis: A306573