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A020644
a(n)-th nonsquarefree is sum of first k nonsquarefrees for some k.
0
1, 4, 18, 53, 134, 154, 170, 319, 348, 373, 400, 460, 522, 552, 588, 661, 741, 858, 899, 985, 1033, 1081, 1275, 1324, 1375, 1769, 1829, 1949, 2143, 2276, 2475, 2687, 2988, 3063, 3222, 3304, 3384, 3466, 3553, 3636, 3724, 3994, 4085, 4469, 4561, 4663, 5055
OFFSET
1,2
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Renaud Lifchitz (100637.64(AT)CompuServe.COM), David W. Wilson
STATUS
approved