99901

Properties

Appears in sequences

• T(n, 2*n-4), T given by A027960.at n=37A027966
• Smallest prime beginning with exactly n 9's.at n=3A065592
• Primes containing 999 as a substring.at n=29A167292
• Primes of the form 2*n^2+6*n+1.at n=35A176549
• Primes of the form 2*n^3 + 5*n^2 + 3*n + 1.at n=16A196153
• Primes having only {0, 1, 9} as digits.at n=47A199329
• Numbers n such that for every k = 1, 2, ..., A305706(n)-1, it is possible to insert plus signs into the decimal representation of n^k to make sum equal n.at n=61A305707
• The upper (or right) offset of a 196-iterate (A006960) from the smallest palindrome greater than the iterate.at n=20A331557
• a(n) is the largest prime factor of 2^n + 5^n.at n=30A337429
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, n)/gcd(x_1, x_2, x_3, n).at n=36A373060
• Prime numbersat n=9585