29749

Appears in sequences

• Reverse of smallest prime factor of k = largest prime factor of k+1; a(1)=1.at n=24A071392
• Number of 6-step S, E, and NW-moving king's tours on an n X n board summed over all starting positions.at n=17A187511
• G.f.: A(x) = Sum_{n>=0} x^(n^2) / Product_{k=1..n} (1 - x^k)^n.at n=26A193197
• Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-9,...,9}.at n=17A239559
• Composite numbers k such that sigma(k + sigma(k)) = 2*sigma(k).at n=28A246858
• Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.at n=11A251143
• Coordination sequence for (2,3,9) tiling of hyperbolic plane.at n=38A265059
• a(n) = floor(Pi^n/Zeta(n)).at n=8A309946
• Main diagonal of A332357.at n=20A332358
• Numerators of the partial sums of the reciprocals of the Dedekind psi function (A001615).at n=23A357818