1514497

Properties

Appears in sequences

• Primes p for which the period of 1/p is a power of 2.at n=18A072982
• Prime divisors of (10^9)^(10^9) + 1 = 10^9000000000 + 1.at n=3A076670
• a(n) = 1 if 10^(2^n)+1 is prime, otherwise smallest prime factor of 10^(2^n)+1.at n=9A102050
• Smallest prime factor of 10^(2^n) + 1.at n=9A185121
• Prime numbersat n=115210