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A013932 Integers that are squarefree and also the sum of first k squarefrees for some k. 7
1, 3, 6, 11, 17, 34, 58, 87, 123, 166, 215, 274, 305, 407, 482, 521, 562, 647, 791, 899, 1073, 1261, 1327, 1394, 1463, 1533, 1677, 1751, 1906, 1985, 2067, 2235, 2321, 2497, 2681, 2870, 2967, 3170, 3273, 3378, 3810, 3921, 4034, 4381, 4622, 4745, 5001, 5131, 5262 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
Select[Accumulate[Select[Range[150], SquareFreeQ]], SquareFreeQ] (* Harvey P. Dale, Jul 27 2011 *)
PROG
(PARI) lista(nn) = {my(s=0); for(k=1, nn, if(issquarefree(k)==1, s+=k; if(issquarefree(s)==1, print1(s, ", ")))); } \\ Jinyuan Wang, Feb 26 2020
CROSSREFS
Sequence in context: A279032 A124454 A335631 * A302550 A310117 A161864
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Jinyuan Wang, Feb 26 2020
STATUS
approved

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)