34953

Appears in sequences

• a(n) = Sum_{d|n} phi(d^4).at n=15A068970
• Expansion of 1/((1-x)*(1+2*x+x^2+2*x^3)).at n=16A077931
• Base-4 digits are, in order, the first n terms of the sequence (1, 3, 21, 203, 2021, 20203, 202021, 2020203, 20202021, 202020203, ... ).at n=8A102865
• Numbers k such that the square of k is the concatenation of two numbers m and m-8.at n=3A115446
• Expansion of 1/((1+x)*(1-2*x)*(1+x^2)).at n=16A115451
• G.f. x^2*(-1+x+x^2)/((1-x)*(2*x-1)*(x+1)*(x^2+1)).at n=19A115851
• First quadrisection of A115451.at n=4A139760
• a(0)=2. a(n+1) = 2*a(n) + period 4: repeat -5,1,3,1.at n=19A161204
• Number of (n+3) X (1+3) 0..1 arrays with each row and column divisible by 15, read as a binary number with top and left being the most significant bits.at n=15A262450
• Number of non-abelian groups of order prime(n)^6.at n=25A271811
• Numbers k such that the k-th standard ordered rooted tree is a generalized Bethe tree (counted by A003238).at n=39A358377
• Number of subsets of {1,2,...,n} such that no two elements differ by 3 or 5.at n=24A375978