a(n) = 1 if 10^(2^n)+1 is prime, otherwise smallest prime factor of 10^(2^n)+1.
A102050
a(n) = 1 if 10^(2^n)+1 is prime, otherwise smallest prime factor of 10^(2^n)+1.
Terms
- a(0) =1a(1) =1a(2) =73a(3) =17a(4) =353a(5) =19841a(6) =1265011073a(7) =257a(8) =10753a(9) =1514497a(11) =106907803649a(12) =458924033
External references
- oeis: A102050