69857

Properties

Appears in sequences

• Irregular table read by rows: row n lists prime factors of 10^n + 1, with multiplicity.at n=50A001271
• Largest prime factor of 10^n + 1.at n=16A003021
• Fibonacci sequence beginning 6, 13.at n=19A022388
• Primes p for which the period of 1/p is a power of 2.at n=15A072982
• Primes p such that p divides 10^n-1, p is the largest prime producing decimal fraction period n and p is not the largest prime dividing 10^n-1.at n=4A081317
• Primes dividing repunits R(10^n) for some n.at n=37A178070
• Sorted version of A061075.at n=14A181086
• x-values in the solutions to x^2 - 5y^2 = 44.at n=20A228210
• Primes p such that p+2 is prime with prime(p+2)-prime(p)=6.at n=29A261533
• Prime factors (counting multiplicity) of 10^10^10^10^2 - 1.at n=39A278835
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1)*b(n), where a(0) = 2, a(1) = 3, b(0) = 1, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A296275
• 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=10A391444
• Prime numbersat n=6925