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A046669 Partial sums of A020639. 5


%S 1,3,6,8,13,15,22,24,27,29,40,42,55,57,60,62,79,81,100,102,105,107,

%T 130,132,137,139,142,144,173,175,206,208,211,213,218,220,257,259,262,

%U 264,305,307,350,352,355,357,404,406,413,415,418,420,473

%N Partial sums of A020639.

%D D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section IV.1.

%H T. D. Noe, <a href="/A046669/b046669.txt">Table of n, a(n) for n=1..1000</a>

%H A. E. Brouwer, <a href="/A046670/a046670.pdf">Two number theoretic sums</a>, Stichting Mathematisch Centrum. Zuivere Wiskunde, Report ZW 19/74 (1974): 3 pages. [Cached copy, included with the permission of the author]

%t Accumulate[Array[FactorInteger[#][[1,1]]&,60]] (* _Harvey P. Dale_, Apr 20 2011 *)

%o (Haskell)

%o a046669 n = a046669_list !! (n-1)

%o A046669_list = scanl1 (+) a020639_list -- _Reinhard Zumkeller_, Jun 15 2013

%Y A088821(n) + 1.

%Y Cf. A046670.

%Y Cf. A072486.

%K nonn,nice,easy

%O 1,2

%A _N. J. A. Sloane_.

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Last modified February 28 01:50 EST 2020. Contains 332319 sequences. (Running on oeis4.)