OFFSET
1,2
REFERENCES
M. Kalecki, On certain sums extended over primes or prime factors (in Polish), Prace Mat., Vol. 8 (1963/64), pp. 121-129.
József Sándor, Dragoslav S. Mitrinovic and Borislav Crstici, Handbook of Number Theory I, Springer Science & Business Media, 2005, Section IV.1, p. 121.
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
A. E. Brouwer, Two number theoretic sums, Stichting Mathematisch Centrum. Zuivere Wiskunde, Report ZW 19/74 (1974): 3 pages. [Cached copy, included with the permission of the author]
FORMULA
a(n) = A088821(n) + 1.
From Amiram Eldar, Mar 04 2021: (Start)
a(n) ~ ((1 + o(1))/2)* n^2/log(n) (Kalecki, 1963/64).
a(n) = (1/2) * n^2/log(n) + O(n^2/log(n)^2) (Brouwer, 1974). (End)
MATHEMATICA
Accumulate[Array[FactorInteger[#][[1, 1]]&, 60]] (* Harvey P. Dale, Apr 20 2011 *)
PROG
(Haskell)
a046669 n = a046669_list !! (n-1)
A046669_list = scanl1 (+) a020639_list -- Reinhard Zumkeller, Jun 15 2013
CROSSREFS
KEYWORD
nonn,nice,easy
AUTHOR
STATUS
approved