1,3

Table of n, a(n) for n=1..74.

(PARI) a(n) = sum(i=1, n, ceil(log(i))) \\ Felix FrÃ¶hlich, Dec 14 2016

Cf. A001855, which is the same sequence for base-2 logarithms.

Sequence in context: A278451 A175269 A318919 * A174059 A321676 A268292

Adjacent sequences: A279536 A279537 A279538 * A279540 A279541 A279542

nonn

Jeffrey Shallit, Dec 14 2016

approved