20209

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 92 ones.at n=9A031860
• Smallest integers at which the value of truncated Mertens function equals the n-th primorial, the product of first n prime numbers.at n=4A093775
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.at n=9A148842
• a(n) = Sum_{k=0..n} p(k)^n, where p(k) is the partition function A000041.at n=5A259437
• Numbers k such that k!4 + 2^5 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).at n=42A291345
• Numbers k such that (86*10^k - 311)/9 is prime.at n=19A293911
• G.f. A(x) satisfies A(x) = 1 + x^3 * A(x)^2 / (1 - x).at n=21A346503