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A257644 First differences of A264100. 3
1, 3, 8, 14, 24, 32, 48, 58, 77, 93, 115, 129, 163, 179, 207, 235, 271, 291, 336, 358, 406, 442, 482, 508, 576, 610, 656, 700, 762, 794, 874, 908, 977, 1029, 1087, 1139, 1239, 1279, 1343, 1403, 1501, 1545, 1649, 1695, 1785, 1869, 1945, 1995, 2129, 2189 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Cumulative sum of A007503, starting with 1.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

PROG

(PARI) alist(n)=my(x); vector(n, k, if(k==1, x=1, x+=sigma(k-1)+numdiv(k-1)))

(Haskell)

a257644 n = a257644_list !! n

a257644_list = scanl (+) 1 a007503_list -- Reinhard Zumkeller, Nov 09 2015

CROSSREFS

Cf. A000005, A000203, A007503, A264100.

Sequence in context: A264689 A146158 A062354 * A135940 A126430 A082474

Adjacent sequences:  A257641 A257642 A257643 * A257645 A257646 A257647

KEYWORD

nonn

AUTHOR

Franklin T. Adams-Watters, Nov 05 2015

STATUS

approved

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Last modified September 20 16:30 EDT 2019. Contains 327242 sequences. (Running on oeis4.)