2906161

Properties

Appears in sequences

• Largest prime factor of the "repunit" number 11...1 (cf. A002275).at n=13A003020
• Largest prime factor of 10^n - 1.at n=14A005422
• Triangle of prime numbers in which n-th row lists all primes p such that 1/p has decimal period n, n >= 1.at n=22A046107
• Greatest prime number p(n) with decimal fraction period of length n.at n=14A061075
• Irregular triangle read by rows in which row n lists prime factors (with multiplicity) of the repunit (10^n - 1)/9 (A002275(n)).at n=48A102380
• Sorted version of A061075.at n=19A181086
• Primes p such that the decimal representation of 1/p does not contain every digit 0-9.at n=39A187614
• a(n) is the greatest prime divisor of 10^(2*n)+10^n+1.at n=4A190839
• a(n) is the greatest prime divisor of 10^(2*n)+10^n+1.at n=9A190839
• Irregular triangle read by rows in which row n lists primitive prime factors of the repunit (10^n - 1)/9 (A002275(n)).at n=23A204845
• Powers of primes other than 2 and 5 in order by cycle length of reciprocal in decimal.at n=25A227969
• Records in A054471.at n=22A243110
• Largest prime factor of A138148(n).at n=14A269503
• Prime numbersat n=210527