0,4

Table of n, a(n) for n=0..75.

M. Baake, Algebra, Combinatorics and Number Theory

M. Baake and R. V. Moody, Similarity submodules and root systems in four dimensions, arXiv:math/9904028 [math.MG], 1999; Canad. J. Math. 51 (1999), 1258-1276.

a(n) = Sum_{k=1..n} A035187(k).

a(n) is asymptotic to c*n where c=2*log(tau)/sqrt(5) and tau=(1+sqrt(5))/2

Array[DivisorSum[#, KroneckerSymbol[5, #]&]&, 76] // Accumulate (* Jean-François Alcover, Dec 13 2018 *)

Sequence in context: A194819 A194235 A029120 * A337634 A316355 A055768

Adjacent sequences: A078425 A078426 A078427 * A078429 A078430 A078431

nonn

Benoit Cloitre, Dec 29 2002

approved