44048

Appears in sequences

• Numbers k > 1 such that, in base 5, k and k^2 contain the same digits in the same proportion.at n=13A061659
• Numbers k such that binomial(2k,k)+1 is prime.at n=46A066699
• E.g.f. satisfies: A(x) = x + arctanh(A(x))^2.at n=5A205886
• Expansion of Product_{k>=1} ((1 + x^(2*k-1))/(1 - x^(2*k-1)))^(k*(k-1)/2).at n=27A294779
• Number of edges formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).at n=16A331765