28781

Appears in sequences

• Number of positive integers <= 2^n of form 5 x^2 + 10 y^2.at n=19A054180
• Triangle T(n,k) of the number of unlabeled graphs on n nodes with universal reconstruction number k, 3<=k<=n. URN(G) is the minimum size for which all multisubsets of vertex-deleted subgraphs of G can uniquely reconstruct G up to isomorphism.at n=23A124003
• Number of steps in base n after which all digits > 0 are present in x(i) where x(i) = x(i-1) + sum of missing digits of x(i-1) with x(0) = 0.at n=6A246426
• Numbers k such that (28*10^k - 13) / 3 is prime.at n=25A262937
• a(n) = Sum_{k=1..n} k^2*tau_3(k), where tau_3 is A007425.at n=19A319088