25007

Appears in sequences

• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 2 (most significant digit on right).at n=7A061931
• Number of free generators of degree n of the primitive Lie algebra of the Hopf algebra of Free quasi-symmetric functions (or Malvenuto-Reutenauer algebra of permutations).at n=7A122826
• (1, 1, 2, 3, 5, 7, 11, ...) convolved with (1, 0, 1, 2, 3, 5, 7, 11, ...); given A000041 = (1, 1, 2, 3, 5, 7, ...).at n=21A179906
• Engel expansion of A060997 = 1.433127...at n=13A185443
• a(n) = number of primes that end in 3 among the first 10^n primes.at n=4A300398
• G.f.: x * Product_{j>=1, k>=1} 1/(1 - a(j)*x^(j*k)).at n=11A308153
• Number of pairwise coprime strict compositions of n, where a singleton is always considered coprime.at n=47A337562