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A329472
Partial sums of numbers that are not squarefree.
6
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
OFFSET
1,1
LINKS
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.
Sequence in context: A270795 A191260 A047965 * A301071 A038430 A301262
KEYWORD
nonn,easy
AUTHOR
Metin Sariyar, Nov 13 2019
STATUS
approved