1265011073

Appears in sequences

• Smallest prime factor of 10^n + 1.at n=64A038371
• Primes p for which the period of 1/p is a power of 2.at n=30A072982
• a(n) = 1 if 10^(2^n)+1 is prime, otherwise smallest prime factor of 10^(2^n)+1.at n=6A102050
• Smallest prime factor of 10^(2^n) + 1.at n=6A185121
• Irregular triangle read by rows: row n lists the distinct prime factors of the generalized Fermat number F_n(10) = 10^(2^n) + 1.at n=15A391444