22554

Appears in sequences

• a(n+1) = floor( (a(n) + 1)^(1 + 1/n) ), with a(1) = 1.at n=11A080869
• a(n) = sum{k=0..floor(n/2), C(2*n-3*k, n)*C(n-k, k)}.at n=8A105871
• Least positive k such that k * [RSA-640]^n - 1 is prime, where RSA-640 is the 193 decimal digit RSA challenge number A391940(14).at n=28A108573
• Number of lines through at least 2 points of a 9 X n grid of points.at n=35A160849
• Smallest integer areas of integer-sided triangles where at least one side is of length prime(n).at n=40A229159
• Expansion of F(x) where F(x) = 1 + x / (1 - x * F(x) - x^2 * F(x^2) ).at n=12A238428
• a(n) = gpf(a(n-3))*gpf(a(n-2)) + gpf(a(n-1)), with a(1)=a(2)=1 and a(3)=2 and where gpf(n) is the greatest prime dividing n, A006530(n).at n=17A258804