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A329472 Partial sums of numbers that are not squarefree. 3
4, 12, 21, 33, 49, 67, 87, 111, 136, 163, 191, 223, 259, 299, 343, 388, 436, 485, 535, 587, 641, 697, 757, 820, 884, 952, 1024, 1099, 1175, 1255, 1336, 1420, 1508, 1598, 1690, 1786, 1884, 1983, 2083, 2187, 2295, 2407, 2523, 2640, 2760, 2881, 3005, 3130, 3256 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Metin Sariyar, Table of n, a(n) for n = 1..16000

FORMULA

a(n) ~ (Pi^2/(2*Pi^2 - 12)) * n^2. - Amiram Eldar, Oct 21 2020

EXAMPLE

49 is a term because 4, 8, 9, 12, 16 are the first five nonsquarefree numbers and 4 + 8 + 9 + 12 + 16 = 49.

MATHEMATICA

Accumulate[Select[Range[1000], !SquareFreeQ[#]&]]

CROSSREFS

Partial sums of A013929.

Cf. A005117, A173143.

Sequence in context: A270795 A191260 A047965 * A301071 A038430 A301262

Adjacent sequences:  A329469 A329470 A329471 * A329473 A329474 A329475

KEYWORD

nonn,easy

AUTHOR

Metin Sariyar, Nov 13 2019

STATUS

approved

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Last modified July 23 22:20 EDT 2021. Contains 346265 sequences. (Running on oeis4.)