20837

Appears in sequences

• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=56A051965
• 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, 1), (-1, 1, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.at n=8A149481
• Semiprimes generated by the polynomial 2 * n^2 + 29.at n=25A241554
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=9A283887
• Composite numbers of the form 2*k^2 + 29.at n=25A352949